How does Cameron become a minister if he's not an MP?
You may wonder how it's possible for David Cameron to become a secretary of state.
In short, he'd have to be sworn into the House of Lords - the upper house of the UK Parliament - as a matter of urgency.
A former prime minister has re-entered government before.
Alec Douglas-Home - Conservative PM from 1963 to 1964 - came back as Ted Heath's foreign secretary, serving from 1970 to 1974.
He, though, was an MP when returning to government.
BBC