Chief Whip Gavin Williamson has been appointed as the new defence secretary after the resignation of Sir Michael Fallon.
Theresa May has moved quickly to replace Sir Michael, who quit on Wednesday over allegations about his past behaviour.
Announcing his resignation, Sir Michael said his conduct had "fallen short" of the required standards.
Mr Williamson has run the Tory whips office since last year.
He has been in Parliament since 2010, representing South Staffordshire.
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