Conservative Shadow Home Secretary David Davis announced on Thursday he would resign from parliament to fight against government plans to increase the time suspects can be held without charge.
Davis' surprise announcement will trigger a by-election in his constituency of Haltemprice and Howden, north of the Humber, which he said he would fight.
"I will argue in this by-election against the slow strangulation of fundamental British freedoms by this government," he said in a statement to reporters outside parliament.
Davis, 59, was a leading critic of the plan to increase the possible pre-charge detention time to 42 from 28 days, on which the government narrowly won a Commons vote late on Wednesday.
Conservative leader David Cameron said he wished Davis well.
"It's a personal decision, a decision he has made," he told reporters. "I wish him well."
Davis will be replaced on the Tory front bench by the current Shadow Attorney General Dominic Grieve.
Güncelleme Tarihi: 13 Haziran 2008, 08:30