Here are today's need-to-know political developments:
- Former Tory cabinet minister Lord Heseltine said David Cameron was "right" to renegotiate the issue of immigration with Europe but said he was "more likely to be successful" if he had the backing of the whole party
- Ex-International Development Secretary Owen Paterson urged the government to maintain the "purdah" period in the run-up to the EU referendum, warning that the result would be "illegitimate" if the public felt it had been "rigged"
- SNP MP Alex Salmond called on political parties in the Commons to join with the SNP to ensure the EU referendum cannot be held on the same day as devolved elections in Scotland, Wales and Northern Ireland
- Former chief whip Andrew Mitchell said he didn't believe the government would be able to persuade Parliament to leave the European Convention on Human Rights
- Shadow chancellor Chris Leslie said all of Labour's policies were "up for review" after the election, and admitted that "with hindsight" the previous Labour government could have spent less and "braced ourselves" more for the 2008 financial crash
- George Osborne is to deputise for David Cameron at Prime Minister's Questions on Wednesday, facing shadow foreign secretary Hilary Benn across the despatch box.