Lib Dems could help install Jeremy Corbyn if he has the support of enough Tories, Jane Dodds says.Read more
But the former Conservative minister says any such government is "a long way down the track".
The Lib Dems leader said she's "been in touch" with both veteran MPs.
Rushcliffe MP Ken Clarke has backed Rory Stewart to be the next leader of the Conservative party.
Theresa May is due to officially stand down as party leader today with Stewart among a large field of candidates vying to replace her.
Mr Clarke told BBC Radio Nottingham: "The time has come for a complete change and a break from what looks like a very damaged political establishment.
"Rory's a very exciting chap. He's not remotely a routine politician who's come up the political ladder in the normal way.
"He would turn over a new page and put us back on the path of One Nation Conservatism."
Ruschliffe MP Ken Clarke, has called the Conservative leadership contest a "shambles" and said there were too many people running.
Theresa May steps down on Friday and 13 Tory MPs so far have put themselves forward to succeed her.
Mr Clarke told BBC Radio 4's Today programme the race was "in danger of becoming a rather tragic farce unless some order is brought into it".
Housing minister James Brokenshire is also urging candidates with little chance of success to pull out before nominations close next week.
Ken Clarke has stood for the Conservative leadership three times before but rules himself out of the next contest.