British Prime Minister David Cameron has dismissed as a "complete fiction" claims that EU leaders could be forced to make new concessions to the UK if it voted to leave the EU.
He made the statements in reaction to ex-Conservative leader Lord Howard saying an Out vote in June could be followed by more talks and another vote to allow the UK to stay on better terms.
Cameron said the British public is facing a "simple and final decision" about whether to stay in or leave the EU.
Visiting Wales, Cameron said he disagreed with those putting forward the idea of a second referendum, which has also been hinted at by Boris Johnson.
"I happen to think this idea that there is some third way, as some are suggesting, between in and out...is a complete fiction. It is a very simple question on the ballot paper - you either stay in the EU or you leave. People really need to understand it is a single decision, it is a final decision," he said.
He once again said that the country would be "better off" if the UK remains in the EU, challenging those who disagreed with him to acknowledge that exiting - a process which could take up to two years - would cause some "economic pain."
Cameron once again insisted that he would not quit as prime minister if the UK voted to leave saying the vote was not about the "future of any politician or political team."
The British people are going to the polls on June 23 to decide about the future of their country’s membership in the EU.