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LONDON — British Prime Minister Rishi Sunak was accused Wednesday of leading a ''chaotic'' government as another one of his Conservative lawmakers defected to the main opposition Labour Party ahead of a looming general election.

In a stunning move just ahead of weekly prime minister's questions, Natalie Elphicke crossed the floor of the House of Commons to join the ranks of Keir Starmer's Labour Party, which appears to be heading to return to power after 14 years in opposition.

Elphicke, who represents the constituency of Dover, which is at the front-line of migrant crossings from France, lashed out at the ''broken promises of Rishi Sunak's tired and chaotic government" and said that Labour now occupies the center ground of British politics.

''From small boats to biosecurity, Rishi Sunak's government is failing to keep our borders safe and secure," she said. "Lives are being lost in the English Channel while small boat arrivals are once again at record levels."

Sunak has made stopping small boat arrivals one of his main priorities, notably with his controversial plan to send some asylum-seekers to Rwanda.

Starmer welcomed Elphicke to the Labour benches as well as Chris Webb, the party's new lawmaker in Blackpool South in northwest England following his big victory in a special election last Thursday.

Elphicke is the second Conservative lawmaker to defect to Labour in two weeks after Dan Poulter quit in anger over the government's handling of the National Health Service.

Starmer called on Sunak to call a general election now as he wondered what was the point of ''this failed government staggering on'' when even the Conservative lawmaker ''on the front line of small boats crisis says the prime minister cannot be trusted with our borders and joins Labour?''

Last week, the Conservatives suffered a historic drubbing in local elections, losing nearly half of its candidates, while Labour made gains and won most of the key mayoral races it fought, including in London.

In the U.K., the date of the general election rests in the hands of the prime minister. It has to take place by January, and Sunak has repeatedly said that his ''working assumption'' was that it would take place in the second half of 2024.