Liam Fox's resignation has not come as a surprise to political commentators, here is a round up of reaction from Westminster.
James Forsyth in the Spectator predicts that Fox will not cause any trouble for Cameron now he is out of the cabinet, not least because he'd find "no more than a handful of supporters on the backbenches".
Rafael Behr in the New Statesman says that the sensitive nature of Fox's job proved to be his undoing.
"There was simply too high a volume of mystery around Werrity -- and what personal agenda he might have had -- for people, including ultimately the Prime Minister, to be relaxed about him swanning in and out of the MoD and taking intimate foreign trips with the Defence Secretary," he says.
Jim Pickard in the Financial Times says the only surprise about Liam Fox’s resignation was is that it took so long to happen, particularly given the revelations about where Werrity was getting his money from. "Clinging to office after this revelation was bizarre and, ultimately, untenable," he says.
But despite the media scrum Peter Oborne in the Telegraph the resignation is "not nearly as big a deal as it looks".
"He will sink without trace, and the waves will close over him fast," Oborne predicts.
Simon Heffer in the Daily Mail says Fox had to go to prevent even greater damage to the government.
"Had Mr Cameron allowed this farce to go on, he and his administration would have been damaged possibly even more than Dr Fox was. The coalition has tensions enough within it as it is: it needed this like the proverbial hole in the head," he writes.