Sir Vince Cable has called for Jeremy Corbyn to "thrown down the gauntlet" and force a general election
Appearing on the breakfast show, the Liberal Democrat leader said Mr Corbyn should file a motion of no-confidence and "see where he stands"
"All the focus is on Theresa May at the moment but Corbyn's getting off with very little scrutiny," he told Julia Hartley-Brewer.
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"Jeremy Corbyn has been breathing fury saying we must have an election. Why doesn't he throw down the gauntlet and say the version of no-confidence and see where he stands?.
"That would capture the mood I think and if the government is in a weak position then it's an opportunity to show whether they can keep on governing."
'Got off lightly'
The politician added that there was "no prospect" of negotiating a "better" Brexit deal with the EU, and that "quite a lot" of European countries believed the UK had "got off lightly".
"There's no prospect of getting a better deal, we either vote it down or not," Sir Vince said.
He added that if Theresa May were to put the draft agreement to a People's Vote, she might be "surprised" at the "number of people that would support it".