Rosie Duffield was among the 432 MPs who voted last night to reject the government’s Brexit deal, which was intended to set out the terms of Britain’s departure from the European Union on 29 March.
Theresa May’s government lost the vote by 230, the largest defeat for a sitting government in history.
Shortly before the vote, Ms Duffield said: “Tonight I will be voting down Theresa May’s bad Brexit deal.
“It fails to meet the promises made in the referendum and settles nothing.”
Elected in 2017, Ms Duffield is Canterbury and Whitstable’s first ever Labour MP.
Labour leader Jeremy Corbyn has now tabled a vote of no confidence in the government, which could trigger a general election.
The confidence vote is expected to be held at about 7pm today (Wednesday).
North Thanet MP Roger Gale and Ashford’s Damian Green were among the 202 Conservatives who supported the Prime Minister’s deal.
South Thanet’s Craig Mackinley and Dover’s Charlie Elphicke were among the 118 Tory rebels who rejected it.