Kate Hoey has said the Conservative Party and Labour risk being "decimated” at a general election if they fail to deliver Brexit by October 31.
The Labour MP told talkRADIO’s Julia Hartley-Brewer the major parties were being squeezed out by the Brexit Party and the Liberal Democrats, who have been more concrete on their Brexit stance.
“It will make MPs realise that they actually have to honour that result if they’re going to have any credibility,” she said.
"Both main parties are going to be decimated at the next general election, which I think is bound to come in the next year whatever happens to the Conservative leadership.”
She said leadership frontrunner Boris Johnson is a “believer” in delivering Brexit despite not yet revealing his plan to leave the UK.
Ms Hoey worked with Mr Johnson when he was the mayor of London, but said she does not expect "great detail" on how he plans to leave the EU.
“I would trust Boris better than Jeremy Hunt because Boris is, I believe now, certainly a believer in leaving, and his whole credibility as the new Prime Minister if elected would be that he had to get us out,” she added.
“Leavers this morning must be waking up and be absolutely convinced that they have to do even more to make sure that their MPs are going to vote the right way when it comes to any vote.”