Sir Michael Fallon has returned to the Commons benches for the first time since resigning from Theresa May's Cabinet following allegations about his conduct.
The former defence secretary arrived in the chamber ahead of the Budget debate resuming for a second day.
He took up a seat on the fourth row and spoke with Tory colleagues as MPs questioned Work and Pensions Secretary David Gauke about Universal Credit.
Sir Michael quit his role earlier this month after admitting his behaviour had "fallen below the high standards required".
He was one of the most senior ministers caught in a wave of allegations of improper behaviour around Westminster.
Sir Michael admitted putting his hand on the knee of radio presenter Julia Hartley-Brewer some years ago.
Days after his resignation it emerged that journalist Jane Merrick contacted Downing Street hours before his abrupt departure claiming that he had lunged at her and tried to kiss her on the lips in 2003.
Opening the second day of the Budget debate, shadow chancellor John McDonnell questioned Philip Hammond's assertions that the economy is strong given that growth forecasts have been downgraded.
He also told MPs: "After a disastrous election campaign and a party conference that literally fell apart, yesterday's Budget's sole purpose was to revive the fortunes of the Conservative Party - and maybe fend off for a time the Tory pack that had been hounding the Chancellor week after week.
"But what this Budget shows is just how out of touch and cut off from the real world of the economy and the real lives of people the Chancellor and his Government really is."
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