Need a refresher on all things impeachment? We've got you covered.

SIMPLE GUIDE: If you want a basic take on what's going on, this one's for you

GO DEEPER: Here's a 100, 300 and 800-word summary of the story

WHAT'S IMPEACHMENT? It's a political process to remove a president - video guide

VIEW FROM COAL COUNTRY: Watch residents in West Virginia react

CONTEXT: Why Ukraine matters to the US

FACT-CHECK: Is the whistleblower linked to the Democrats?

Image source, Drew Angerer/Getty Images

Speaking to reporters in Brussels, Secretary of State Mike Pompeo said he hadn't watched Sondland's testimony.

"I didn't see a single thing today. I was working. Sounds like you might not have been," Pompeo said, adding he was "very proud" of what the state department had accomplished in Ukraine.

In his testimony Sondland implicated Pompeo. The EU ambassador said several times that the secretary of state had been "in the loop" on all of his actions tied to Ukraine.

As a distraction to the impeachment probe's partisan tug-of-war, the Twitterverse has taken to casting the impeachment movie - sure to make it to Hollywood soon.

Sondland is still in the middle of his testimony but the internet has already spoken on who will play the ambassador to the EU on the big screen: actor Steven Tobolowsky - best known for his role in Groundhog Day.

Ohio Republican Mike Turner asks Sondland if the CNN headline is correct that Sondland has testified today that Trump made US military aid conditional on Ukraine announcing an investigation into the Bidens.

"Is that your testimony today, Ambassador Sondland, that you have evidence that Donald Trump tied the investigations to aid?"

"I've said repeatedly, congressman, I was presuming," says Sondland. He says he understood from other US officials that US military aid and a Trump-Zelensky meeting were linked to an investigation of the Bidens.

"Nobody else on this planet told you that Donald Trump was tying aid to these investigations, is that correct?" says Turner.

Sondland confirms that is correct.

He says he has no evidence "other than my own presumption".

"Which is nothing!" Turner retorts, adding: "You know what made-up testimony is? Made-up testimony is when I just presume it."

Anthony Zurcher
BBC North America reporter

With Gordon Sondland going on record saying that his Ukrainian activities were done at the direction of the Donald Trump, it would seem much harder now for the president to say he “hardly knows” Sondland or deny he had repeated interactions with him.

In comments at the White House during Sondland’s testimony, however, the president stuck by this insistence.

“That is not a man I know well,” Trump said. He also noted Sondland testified that he told the ambassador he wanted “nothing” from the Ukrainians and that there was no “quid pro quo”.

The problem for the president is that while that conversation may have been helpful in his defence, much of the remainder of Sondland’s testimony was extremely damaging.

While the president may not have directly spoken of conditioning a White House visit or military aid on Ukrainian investigations, Sondland said it was clear to him that this was the president’s intent.

Image source, Getty Images

It will be next to impossible for Trump and his supporters to paint Giuliani – who was talking about quid pro quos - as a foreign policy freelancer who was operating on his own and not at the behest of the president.

The president’s defenders may suggest Sondland is making things up or that his memory is off - although he provided documents supporting his assertions and other testimony backs his latest accounts.

Read Anthony's full analysis here.

The BBC's Ed Habershon has been attending the impeachment hearings on Capitol Hill.

He reports that far more people are trying to get in to see Sondland's blockbuster testimony than earlier witnesses.

Ukrainian President Volodymyr Zelensky said yesterday his country is "so tired" of the impeachment inquiry.

"I think everybody in Ukraine is so tired about Burisma," Zelensky said, answering a CNN reporter's question asking if he would launch investigations into the Bidens and the 2016 election.

"We have our own country. We have our independence, we have our problems and questions. That's it."

Zelensky told reporters last month there was “no blackmail” in the call with Donald Trump that led to this impeachment probe.

"There was no blackmail. It was not the subject of our conversation."

He said the purpose of the conversation was to arrange a meeting with Trump, and there were no "conditions" from the American side.

Zelensky also said he does not believe US-Ukraine relations will be affected by the impeachment inquiry.

Read the full story here.

The text messages between top diplomats Sondland, Kurt Volker and Bill Taylor keep coming up in these testimonies.

They were some of the first pieces of evidence to make headlines in this inquiry - so here's a refresher.

The texts between the diplomats suggest it was clear what the president wanted: Ukraine to open investigations into the election and the Bidens.

Sondland and Volker discussed what Ukraine's President Zelensky should say - including references to Burisma, the company Joe Biden's son worked for, and the 2016 election.

And the diplomats also talked about what was possibly at stake - military aid and a meeting.

The BBC's North America reporter Anthony Zurcher explained the significance of the texts here.

And you can catch up on the full story here.

Image source, FiveThirtyEight

Sondland says he believes the Ukrainian aid was tied to a public promise of investigations - demanded by Trump's personal lawyer.

But according to analysis from FiveThirtyEight, a statistics-driven news website, external, the "vast majority" of Republicans do not think that President Trump linked military aid to an investigation of former Vice-President Joe Biden and his son.

But - as the analysis shows - about two-thirds of those people also say it would be inappropriate if it did happen.

Sondland repeated several times that while he believed the military aid to Ukraine to be contingent upon two investigations - the 2016 US election and Burisma, a Ukrainian gas company - he was not aware until later that Burisma employed the son of former Vice-President Joe Biden.

"I didn't know" of the Burisma-Biden connection, Sondland testifies.

The link between Burisma and Biden is central to the Democratic push to impeach the president, as Democrats say Trump exploited his power to hurt a domestic political rival: Joe Biden.

The BBC's Anthony Zurcher tells us if the impeachment inquiry will help or hurt Biden.

And you can see what the Bidens were doing in Ukraine in the video below.

As he headed off to Texas, the president told reporters on the White House lawn that Sondland's testimony showed he wanted nothing from Ukraine.

Moments later, he began retweeting his party members' defence of him while he was in the air heading west.

While the hearing takes a 30-minute lunch break, let's look at some impeachment humour from Twitter...

Image source, Getty Images

A mystery whistleblower, a wealthy hotelier and the president of the United States.

These are some of the main players in a story that is becoming ever more complex - and could see the president being impeached.

Catch up on the cast here.

Members of the president's party are taking their defence of Trump to social media.

Here's Mark Meadows, a North Carolina Republican, tangling with a CNN legal analyst on Twitter over what exactly Sondland heard.

Need a refresher on all things impeachment? We've got you covered.

SIMPLE GUIDE: If you want a basic take on what's going on, this one's for you

GO DEEPER: Here's a 100, 300 and 800-word summary of the story

WHAT'S IMPEACHMENT? It's a political process to remove a president - video guide

VIEW FROM COAL COUNTRY: Watch residents in West Virginia react

CONTEXT: Why Ukraine matters to the US

FACT-CHECK: Is the whistleblower linked to the Democrats?

Image source, Alamy

Let's take a step back: How did the Trump-Ukraine saga begin?

It's a complicated story, but we've summed it up in three parts for you here.

Relive the drama on the White House South Lawn...

Image source, Mark Wilson/Getty Images

White House Press Secretary Stephanie Grisham has echoed Trump's earlier comment to reporters.

"Ambassador Sondland’s testimony made clear that in one of the few brief phone calls he had with President Trump, the President clearly stated that he ‘wanted nothing’ from Ukraine and repeated ‘no quid pro quo over and over again’," Grisham said in a statement.

"In fact, no quid pro quo ever occurred. The US aid to Ukraine flowed, no investigation was launched, and President Trump has met and spoken with President Zelensky. Democrats keep chasing ghosts."

Image source, Twitter

Rudy Giuliani, the president's personal lawyer, has fired back in a now-deleted tweet, after being bad-mouthed by today's impeachment witness.

"I never met him," Giuliani says of Sondland.