His finance minister and Health Secretary quit on Tuesday, along with several other more junior government officials, after a series of controversies.
On Wednesday Boris Johnson will face Prime Minister's Questions, and a grilling from the Liaison Committee of senior MPs.
Liberal Democrat leader Sir Ed Davey says he needs to go now.
IN: 'Well...
OUT: ...today.'
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LINK: http://fsnradionews.com/feeds/0706johnson-davey1.mp3