David Cameron, Ed Miliband, Nick Clegg and George Osborne will all give evidence to the Leveson inquiry into press ethics next week, it has been announced.
The prime minister is due to be grilled over his relationship with the media, particularly his links to News Corporation and his friendship with Rebekah Brooks when he gives evidence on Thursday.
Cameron is also likely to be questioned over his decision to hand Jeremy Hunt responsibility for impartially adjudicating News Corp's bid for BSkyB, despite knowing the culture secretary was strongly in favour of it being approved.
He is likely to be questioned as to the wisdom of hiring former News of the World editor Andy Coulson to be his communications director.
The prime minister will also have to face embarrassing questions about the revelation that he rode Rebekah Brook's horse and the friendly way he spoke to her via text message.
Chancellor George Osborne will give evidence on Monday, having initially not being called to appear in person.
However Osborne is arguably the Conservative Party's key strategist and his name was raised frequently by other witnesses as playing a central role in setting out the the party's communication strategy.
Ed Miliband will give evidence on Tuesday afternoon, he faces questions about Labour's historical links to News Corporation as well as how the media was dealt with during his time as an adviser and minister in the last government.
Deputy prime minister Nick Clegg will appear on Wednesday morning and will be followed by Scottish first minister Alex Salmond.
Gordon Brown will be the first witness of the week when he gives evidence on Monday morning. The former Labour prime minister is likely to be asked about Labour's relationship with News International, as well as The Sun's decision to switch its support to the Tories at the 2010 general election.
Leveson will also hear from Labour deputy leader Harriet Harman and former Conservative prime minister John Major on Tuesday.
What The Other Witnesses Have Said
Jeremy Hunt: I Considered Quitting Over BSkyB Row
Rebekah Brooks: David Cameron Signed Off His Texts 'LOL'
DCMS Permanent Secretary Jonathan Stephens: Hunt Urged Cameron To Back News Corp Bid
Ken Clarke: The Press Is More Powerful Than Parliament
Michael Gove: Rupert Murdoch Is A 'Impressive And Significant' Man
Tony Blair: I Chose Not To Take On The Press