Michael Gove's speech in Parliament on the state of the Labour leadership before the Government won a vote of no-confidence.
Michael Gove takes apart In full: Jeremy Corbyn on Brexit, 1 day ago 11:24
In full: Jeremy Corbyn on Brexit, Michael Gove takes apart 1 day ago 13:08
Deputy Labour leader Tom Watson described the party's response to the defectors as a "knee-jerk" and "spiteful" reaction.
When asked about Mr Watson's comments the Labour leader told ITV News his raised the need for by-elections as a "democratic argument".
He said: "I don't behave in a knee-jerk or spiteful way, I simply say if you've been elected to Parliament on a manifesto for the many not the few, which you were in the General Election and you then resign from the party and say you're doing something else because you're an individual who happens to be an MP.
"Surely you owe something to the people that put you there?"
He added: "If you resign, have a by-election and decide whether you or somebody else will be the MP for that area. Surely that's democratic?"
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