Amber Rudd has resigned as home secretary, saying she “inadvertently misled” MPs over targets for removing illegal immigrants.
The Windrush scandal had heaped pressure on Ms Rudd, who faced renewed criticism after saying she did not know about Home Office removals targets.
Her successor is expected to be announced within hours by Theresa May, who was “very sorry” to see Ms Rudd go.
Shadow home secretary Diane Abbott said Ms Rudd had “done the right thing”.
Ms Abbott added that the “architect of this crisis” – the prime minister – must come before the Commons to explain “whether she knew that Amber Rudd was misleading Parliament and the public last week”.
Ms Rudd told MPs last week the Home Office did not have targets for removing illegal immigrants, but on Sunday the Guardian published a letter in which Ms Rudd set out her “ambitious but deliverable” aim to deport 10% more illegal immigrants over the “next few years” to Theresa May.
Ms Rudd is the fourth person forced to resign from the cabinet in the last six months – following Sir Michael Fallon, Priti Patel and Damian Green.
Transport Secretary Chris Grayling denied the government was in chaos, telling BBC Radio 4’s Today the spate of recent resignations were “unwanted noise” but there were always “up and downs” in politics.