Gordon Brown has been called to give evidence to the Iraq Inquiry, but will not appear until after next year's general election.
Sir John Chilcot's committee will also wait until after the election to question Foreign Secretary David Miliband and International Development Secretary Douglas Alexander.
The move comes after Sir John, a retired Whitehall mandarin, insisted that his inquiry would "remain firmly outside party politics".
The committee also revealed on Wednesday that Alastair Campbell has been summoned to appear early in the New Year.
Tony Blair's former chief spin doctor will give evidence in January or early February before the inquiry takes a break until after the election.
The Prime Minister is required to call an election by June at the latest.