The PM says he was not aware of “specific concerns” about Sir Gavin’s conduct in previous roles.
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Rishi Sunak has said he regrets bringing Sir Gavin Williamson back into government, after he quit as a minister following bullying claims.
The prime minister said Sir Gavin had been right to resign, adding his behaviour had been “unacceptable”.
Mr Sunak said he had not known of “specific concerns” about his conduct in two previous ministerial roles.
But Labour’s Sir Keir Starmer accused him of failing to “stand up to a run-of-the-mill bully”.
Sir Gavin was appointed minister without portfolio after Mr Sunak, a political ally, won the Tory leadership and became prime minister two weeks ago.
Mr Sunak has faced criticism over the decision in recent days, following claims of abusive behaviour by Sir Gavin towards MPs and the emergence of a complaint by a civil servant.
Sir Gavin, who has denied any wrongdoing, quit on Tuesday night, vowing he wanted to “clear my name” during probes into his past conduct.
Speaking at Prime Minister’s Questions, Mr Sunak said it was “absolutely right” Sir Gavin had gone, and that his behaviour was now being investigated.
“I obviously regret appointing someone who has had to resign in these circumstances,” he added.
Complaints against Sir Gavin emerged after expletive-laden texts he sent to then-chief whip Wendy Morton last month were published in the Sunday Times.
A civil servant then told the Guardian Sir Gavin had told them to “slit your throat” and “jump out of the window” on separate occasions during his time as defence secretary.
Sir Gavin’s former deputy, Anne Milton, has also claimed he had behaved in a “threatening” and “intimidating” way towards MPs while he was chief whip.
Image source, Reuters
At PMQs, Mr Sunak said he “did not know about any of the specific concerns” about his conduct as defence secretary or chief whip.
Downing Street has previously said the PM was aware of a “disagreement” between Sir Gavin and Ms Morton before appointing him, but not the detail of the messages he had sent her.
In response, Labour’s Sir Keir said Sir Gavin had “spent years courting the idea that he can intimidate others, blurring the lines to normalise bullying behaviour”.
“It’s precisely why the prime minister gave him a job,” he added.
The Labour leader also criticised Mr Sunak for thanking Sir Gavin for his “personal support and loyalty” in a letter responding to his resignation.
“What message does he think it sends when, rather than take on the bullies, he lines up alongside and thanks them for their loyalty?” Sir Keir added.