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Shadow home secretary David Davis is set to resign as an MP, the BBC understands.
There has been speculation he wants to trigger a by-election in his Haltemprice and Howden seat.
Mr Davis has been a passionate opponent of plans to extend the terror detention limit to 42 days.
The 59-year-old is one of the best known Conservatives, and was runner-up to David Cameron in the party leadership election in 2005.
News of his planned resignation came as a complete surprise in Westminster - and speculation is rife about his possible motives.
Conservative sources have told BBC Political Editor Nick Robinson Mr Davis told Mr Cameron of his decision on Wednesday evening.
His by-election campaign would be "personal and not backed by the full resources of the Conservative Party", the source added.
Sources say Mr Davis wants to fight a by-election on the 42-day issue.
(BBC)
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