Lord Michael Heseltine has claimed Brexit will continue to be a thorn in the side of the Conservative Party as they regroup in the wake of last week's election.
Theresa May had attempted to predicate the election on Brexit, but her gamble to get a majority for negotiations failed after the vote resulted in a hung Parliament.
The Prime Minister is now planning to form a government with the backing of the Democratic Unionist Party (DUP).
Lord Heseltine, the former Deputy Prime Minister under John Major, said the prospect of the upcoming negotiations will continue to "gnaw" at the Tories.
He told Paul Ross: "Brexit is the cancer gnawing at the heart of the Tory party.
"The challenge now is to find a way to revise the policy to ensure people can unite.
"The party needs to have a period in which it can work out who it wants, and what the policies will be. We don’t want a re-run of the last election, that will not secure us power.
"The alternative is the prospect of Jeremy Corbyn as PM."