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It's been a busy day in Westminster... but it is time for us to bring this page to a close.

With the resignation of Lord Keen breaking as we go, there is sure to be more coming out of SW1 tonight.

So follow us on Twitter @BBCPolitics, external and keen an eye on our pages of the BBC News website for more updates.

See you again next week for more PMQs action.

Select Committee
Parliament

Boris Johnson has just finished a 90-minute question-and-answer session with senior MPs sitting on the Commons Liaison Committee. He's what he said:

• The PM admitted Covid-19 testing capacity was currently insufficient, after demand "massively accelerated" over the past couple of weeks
• He added that a second national lockdown would be "disastrous" for the economy, and ministers are doing "everything in our power” to avoid it

• He said the science to allow mass population testing was "almost there", but rolling out testing at venues like theatres and stadiums is "some way off"

• On Brexit, he said he did not believe the EU was negotiating in good faith, external over the interpretation of the UK's withdrawal agreement signed last year

BBC Politics

Lord Keen has quit as the UK government's senior law officer for Scotland.

But just a short while ago when the PM was asked if he was still in post, Boris Johnson said conversations were "continuing".

Not for much longer it now seems...

BBC Scotland earlier reported that Lord Keen - the government's chief lawyer for the nation - had offered his resignation to Boris Johnson.

But, at the time, it was unclear whether it was going to be accepted by No 10.

And even in the Liaison Committee, the PM said "conversations were continuing" over whether he would stay on or not. Peculiar language?

Now, a statement has dropped from No 10 and it is now official he has quit.

A Downing Street spokesman said: “Lord Keen has resigned as Advocate General for Scotland. The prime minister thanks him for his service.”

While Boris Johnson was appearing before MPs, Foreign Secretary Dominic Raab and his US counterpart Mike Pompeo have been giving a press conference in Washington.

Mr Raab is on a two-day visit to the US capital, the last by a senior UK government minister before November's presidential election.

The US Secretary of State was asked if he had any concerns about the implications for peace in Northern Ireland of the UK's approach to its negotiations with the EU.

Select Committee
Parliament

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A couple of follow up questions which the prime minister agrees to stay and answer before the session comes to a close.

The SNP's Angus MacNeil asks who will be responsible if reports of long lorry queues in Kent come to fruition after Brexit.

"I don't think anybody has any illusions who is going to be held to account," says Johnson. "It is certainly going to be me."

And finally, his Conservative colleague Greg Clark asks him what the PM is monitoring to ensure young people, who are making "huge sacrifices" will be allowed out of the "rule of six" measure sooner rather than later.

Johnson says the "single most important fact is what is the R doing, where is the R going".

R is the reproduction number, or R value, for Covid-19.

Johnson continues, "And alas, alas, alas, having been under one for so many months, after the fantastic efforts of the British people, it is now above one".

And that is it. The Liaison Committee has ended and back to No 10 the PM goes.

Select Committee
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The next question comes from Conservative MP, Tobias Ellwood, chair of the defence committee.

He asks whether more use could be made of the Ministry of Defence in the government's response to the Covid-19 pandemic.

Mr Johnson praises the "outstanding" officers he has met during the crisis, adding he was "bowled over" with the Army's efforts in distributing Covid tests.

Mr Ellwood asks the PM to "recognise the importance" of conventional military equipment despite the need to invest more in areas such as cyber warfare.

Mr Johnson says the UK is set for a "fantastic time" when it comes to shipbuilding.

Select Committee
Parliament

Select Committee
Parliament

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By video link, Labour's Sarah Champion asks whether the PM is looking to amend the International Development Act and what it constitutes as overseas aid within it.

Johnson said he would "reserve his position on amending the act".

But he adds: "What we certainly want to do is ensure that ODA (overseas development assistance) is better spent on serving the interests... the diplomatic and the political values of the UK, and indeed the commercial and jobs interest of the UK."

Asked which regions may lose out as a result when such changes are made, the PM said it was "like asking a lion to choose between its cubs".

He says he "doesn't accept the idea" that you need to remove parts of the world from the list to invest in others.

Select Committee
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Tom Tugendhat asks whether Japan should be allowed to join the so-called Five Eyes intelligence-sharing pact between the UK and the US, Canada, Australia and New Zealand.

Mr Johnson says this is not something Japan has raised with him, but it is an “idea we’re thinking about".

He adds it “might be a productive way” to build on the UK's relationship with Japan.

He cautions though that the group has its “particular coherence," and the UK would have to work with its intelligence sharing partners over the proposal.

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Parliament

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For their last section, MPs are now questioning the PM about an ongoing review of the UK's foreign and security policies.

Conservative MP Tom Tugendhat, who chairs the foreign affairs committee, asks whether the treatment of Uighur Muslims by the Chinese state in Xinjiang province "amounts to genocide".

In reply, Mr Johnson says he finds their treatment "objectionable," but genocide is an "important term in international law" and he doesn't believe the UK is so far in a position to use it regarding Xinjiang.

He says he has raised the issue "many times" with "our Chinese friends".

Reality Check

Asked a few moments ago whether the EU was negotiating in good faith in talks on a future trade deal, the PM cited the fact that the bloc had so far refused to give the UK a "third country" licence to export products of animal origin to the continent.

Mr Johnson has raised the spectre in recent days of British food exports to mainland Europe and Northern Ireland, including lamb, beef and clotted cream, being effectively "blockaded".

But how likely is this?

The BBC's Reality Check correspondent Chris Morris has been looking into the issue and the connection between this and the current political row over the Internal Markers Bill.

He says a blockade seems "highly unlikely" since the EU Withdrawal Agreement contains safeguard measures which allow either side to act if the application of the Northern Ireland Protocol is causing "serious economic difficulties that are liable to persist".

Leila Nathoo
BBC political correspondent

Astonishingly the Prime Minister couldn't answer whether one of his own law officers was still in post - the matter of Lord Keen's resignation, which he offered this morning, was still an 'ongoing' situation, the PM said.

Around his preparation for this committee, Boris Johnson's been having various conversations about his Internal Market Bill, which has provoked anger among some Tory MPs and from the EU.

Sir Bob Neill - who's leading efforts to amend it - was one of those questioning the PM this afternoon, but they didn't divulge the details of their private discussions.

It looks like they might have reached a compromise behind the scenes that could head off a possible rebellion.

But Boris Johnson doubled down on his controversial step of seeking to breach the Brexit divorce deal - saying, provocatively, that he believed the EU had been negotiating in bad faith.

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Meg Hillier comes back in to ask which of the PM's ministers is right - the Justice Secretary Robert Buckland, who said the bill only breaks international law if the power is used, or Northern Ireland Secretary Brandon Lewis, who said it breaks international law just by granting the power.

Johnson will not be drawn on an answer.

Instead, he replies: "My position is the Attorney General's position and the objective of these measures is to protect this country against accidental or unreasonable measures that serve to break up the UK."

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Next up is Conservative MP Sir Robert Neill, who chairs the Commons Justice Committee.

He asks the PM what "practical steps" negotiators are taking to ensure the UK continues to have access to judicial co-operation procedures with the EU, such as criminal databases, after its transition period.

Mr Johnson says he won't "go into detail" on the negotiations but there is "ample scope" to continue co-operation with the 27-country bloc.

Sir Bob asks for an update on efforts to get a so-called "adequacy" ruling from the EU, which would mean it deems UK data protection law reliable enough to share data cross-border.

Mr Johnson says he hopes an agreement in this area can be found by the end of the transition, but does not mention a specific deadline.

Image source, HoC

Select Committee
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The SNP's Angus Brendan MacNeil continues with the Brexit theme.

He asks the PM how many Japan style trade deals the UK needs to "make up the damage Brexit has given us".

Johnson again says he doesn't "accept the characterisation", and says post-Brexit, the UK will be "at the heart of a great cats cradle of deals around the world".

MacNeil asks whether pushing his UK Internal Market Bill is a "price worth paying" after criticism from the likes of Speaker of the United States House of Representatives Nancy Pelosi.

In a tetchy exchange, the SNP MP warns it could mean losing out on a trade deal with those across the Atlantic.

Johnson says he has the "upmost respect" for the US politicians criticising the law.

But, he adds: "I think when they understand and see what we are trying to do, they would share ambition and concern about protecting the balance and symmetry of the UK."

Select Committee
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Sticking with Brexit, next up is Sir William Cash, who chairs the European Scrutiny Committee.

He says the PM's plans to override sections of the withdrawal agreement in a bill is not unprecedented, saying he has around 20 examples of previous UK laws that have done this.

He also says there are examples of the EU breaking international law itself, and accuses the bloc of "double standards" in its protests over the issue.

In reply, the prime ministers says the bill is required to protect the UK internal market from the EU making "extreme" interpretations of the sections of the Brexit divorce deal relating to Northern Ireland.

Select Committee
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Benn - who chairs the Commons committee on the UK's future relationship with the EU - focuses his questioning on Internal Market Bill.

He asks the PM why the existing withdrawal agreement does not do enough to allay his fears and he needs this bill.

Johnson says the new legislation "provides belt and braces protection" and a "water tight bulkhead".

He says he believes it is the "only way... to provide the certainty and the protections that we are talking about" when it comes to UK trade between its nations.

Asked a number of times whether he believes the EU are negotiating in "good faith", the PM eventually replies: "I don't believe they are.

"It is always possible I am mistaken, and perhaps they will prove my suspicions wrong.

"But I prefer to have protections."