Here's a round-up of the main political stories of the day: 

Labour's acting leader Harriet Harman rejects calls for the party to put a mechanism in place to potentially remove its new leader before the next election.

Ms Harman also calls for a "truth and reconciliation" process to get to the bottom of why Labour lost the general election so "badly".

Yvette Cooper attempts to put some distance between herself and Labour leadership rivals Liz Kendall and Andy Burnham with a thinly veiled attack on their respective visions for rebuilding the party.

Simon Stevens, boss of the NHS in England, announces plans to clamp down on "rip-off" staff agencies and dubs obesity "the new smoking".

UKIP MP Douglas Carswell suggests a leading business figure, such as James Dyson, should lead the campaign to get Britain out of the EU. No word yet from the vacuum cleaner mogul and inventor. 

A bit more from Andy Burnham's Pienaar's Politics interview. 

The Labour leadership hopeful branded a new bill in the Queen's Speech a "naked attack" on the trade unions. 

 A Trade Unions Bill will impose a 50% turnout threshold on strike ballots, with a further requirement in essential public services for strikes to be supported by 40% of those entitled to vote. 

 "We've got a government here that is constantly trying to demonise trade unions, undermine the rights of working people and that is something that I will not tolerate," said Mr Burnham. 

Blogger Guido Fawkes is keeping a running total of how much support the Labour leadership contenders have got among Labour MPs. They need 35 to get on the ballot.

Despite being less experienced and well known than Labour leadership rival Yvette Cooper, Liz Kendall has an advantage in that she can say what she believes and what she stands for "in a more effective way," says The Spectator's Isabel Hardman on the BBC's Sunday Politics.

Labour London mayoral hopeful David Lammy takes a swipe at his rivals, saying the city needs someone who is "not a party stooge, not a party hack".

He tells the BBC he learned a valuable lesson as Ken Livingstone's campaign manager at the last mayoral election that London was not automatically a Labour city and the party had to reach out to all sections of the community.

Earlier, the chief executive of NHS England told the BBC the health service plans to "clamp down on some of the staffing agencies ripping off the NHS".

Simon Stevens admitted that NHS hospitals were "over-spending" on temporary staffing.

But he told BBC One's Andrew Marr Show that the NHS would be taking collective action against staffing agencies.

More here. 

The Daily Politics

George Galloway says he won't try to make London an Israel-free zone like Bradford, but tells Andrew Neil he will encourage Palestinian supporters in the city. 

And he says he will probably withdraw from the mayoral race if left winger Diane Abbott is selected as Labour's candidate, but he does not think this will happen. 

The Daily Politics

George Galloway is up next on Sunday Politics. He says he has had a good start to his campaign to be the next mayor of London, with 20,000 people signing up to support him.  

He says the campaign against disposed Tower Hamlets mayor Lutfur Rahman was "unjust". Mr Rahman was removed from office and a poll declared void after he was found guilty of electoral fraud, but Mr Galloway says it should have been left to the electorate.  

The Daily Politics

Labour was not borrowing too much when the financial crisis hit, says Tom Watson. But he adds that the budget deficit did not cause the crisis. 

The Daily Politics

Tom Watson, who is standing to be the next deputy Labour leader, says he has a reputation for being a tough campaigner and that is what the party needs after two election defeats.

He insists his support in the party goes beyond Len McCluskey, the Unite leader.  Everybody's view must be valid, the MP says. 

The Daily Politics

If the EU referendum is going to engage the country, leadership of campaigns should go to people young enough to not have had a vote on Europe last time, says Frank Field, who adds he will be campaigning for exit. 

The Daily Politics

The PM is not being ambitious enough in EU talks, says the Labour MP Frank Field. He tells Andrew Neil red and blue lines for renegotiation need to be made clear. 

The Daily Politics

Cabinet members should be allowed to campaign on both sides of the referendum, says Ken Clarke. Euroscpetics should be allowed a "free exercise" campaigning in the vote, says.

He says a young politician with all-party appeal should lead the Yes campaign to stay in the EU, ruling himself out of the role.

The Daily Politics

Ken Clarke says the EU referendum should be held early. If we let it drag on, it will cause a great deal of uncertainty, says the former justice secretary. We have other things to tackle, he adds. 

The Daily Politics

Tory MP Ken Clarke says there is no point talking about whether there should be a referendum now - it's going to happen. 

He tells Andrew Neil the PM is not asking to repatriate any powers - no powers could be found that were doing any harm. It's mainly economic reforms, which Mr Clarke thinks the PM will get. 

BBC Radio 5 Live

Orkney Lib Dem Richard Thomas tells John Pienaar Alistair Carmichael has apologised; "that should be the end of it... worse things have happened".

But the SNP's Tim Morrison says Mr Carmichael, who admitted authorising the leake of a memo suggesting Nicola Sturgeon wanted David Cameron as prime minister, should resign and face the people. He says people are giving him money for the campaign to oust Mr Carmichael when he goes to the local shops.