UK Prime Minister David Cameron warns about Britain’s possible exit from the European Union, saying those supporting the idea hardly have a vision of what will happen afterwards.

Cameron has once again addressed Brexit supporters and called on them to carefully weigh the consequences of a provisional exit from the bloc.

He said supporters of the ‘Leave’ camp must know this is going to be the UK’s “gamble of the century” as the country’s future is at stake.

Days after six cabinet ministers announced their support for UK’s EU exit, Cameron wrote in an article in The Telegraph that the ministers need to spell out the kind of trading relationship Britain would have outside the EU and demands that they detail how the UK would cooperate with other countries to stop terrorists.

He said jobs, the cost of living and family finances are all at stake in the UK’s EU referendum on June 23.

Cameron asked EU membership opponents “what trading relationship would Britain have with Europe after leaving?”

“The second question is: how long would it take to put a new relationship in place – and how great would the uncertainty be for families and businesses in the meantime?”

“The third question is about security. Today Britain has a whole set of arrangements with our European neighbors: the European Arrest Warrant, access to European criminal records, sharing information to stop terrorists coming to our country.”

“Fourth, there’s a bigger question about our role in the world: outside the EU, is Britain more able or less able to get things done?”

The comments come as a majority of political figures and large companies have so far thrown their support behind the pro-EU drive.

However, the campaign supporting Britain’s withdrawal from the EU is also gaining momentum. Britain’s continued EU membership will be put to a referendum on June 23.