Lord Heseltine has announced the Conservatives would be "entitled" to kick him out of the party, after he pledged his support to the Liberal Democrats.
The Tory peer and former deputy Prime Minister has been facing calls for expulsion after he revealed he would be backing a Lib Dem candidate in the upcoming EU elections.
"I do not know if the Conservative Party want to eject me. Of course they are fully entitled to do so," Lord Heseltine told talkRADIO's Julia Hartley-Brewer.
"I used very careful words. I said I'm lending him my support. I remain a member of the Conservative Party, I take the whip in the House of Lords and all that will continue."
Writing in the Sunday Times, Lord Heseltine, who was a Tory MP for 35 years, said he disagreed with the government's stance on Brexit, writing: "I cannot, with a clear conscience, vote for my party when it is myopically focused on forcing through the biggest act of economic self-harm ever undertaken by a democratic government.”
But he told the talkRADIO breakfast show he would still "continue to support" the Conservatives, despite his claims that it had been “infected with the virus of extremism”.
"I shall continue to support the Conservative Party, except on this one issue of Europe," he added.
"They may want to bear in mind that five million people who voted to remain are supporters of the Conservative Party."
Liberal Democrat leader Sir Vince Cable told talkRADIO he was "delighted" to have the support of Lord Heseltine.
"I once asked him if he'd join us and he said no, I'm a Tory until my dying days," Sir Vince reminisced
To see the full list of EU election candidates, click here.