Michael Gove
Michael Gove says David Cameron's reforms could be overturned by European judgesReuters

Justice secretary Michael Gove, one of the biggest hitters in the Brexit campaign, has explained why he is opposing David Cameron on the EU referendum debate. He says that reforms the prime minister lobbied for are not legally binding and could be overturned by European judges. However, Cameron has said the package is "already legally binding and irreversible".

Gove said the European Court of Justice (ECJ) was not bound by Cameron's deal unless treaties are changed. Gove told the BBC that Cameron was "absolutely right that this is a deal between 28 nations" but "the whole point about the ECJ is that it stands above the nation states." He added that we don't know when any treaties will be changed.

They are Gove's first public comments since deciding to oppose Cameron in the referendum. Gove dubbed the EU "old-fashioned" and said a vote to leave the EU would offer "a tremendous opportunity for Britain to recover its mojo".

Meanwhile, Gove's wife Sarah Vine has written in the Daily Mail detailing how the prime minister was shocked at the justice secretary's decision to oppose him. In her column she outlined how Downing Street had tried to change his mind and that: "Mr Cameron was expecting opposition from all sorts of people, but not from Michael."

She pointed out that Gove's friendship with Cameron could weather the storm. She added: "If, at the end of the day, he can't stand up for what he believes in, then what's the point?"