Nick Clegg said he "cannot envisage any circumstances" that would see the coalition collapse before the 2015 general election.
The Deputy Prime Minister added that he "really thought" the Liberal Democrats and Conservatives would continue governing until that time.
More top news
Higher food and petrol prices are expected to send inflation to its highest level in 28 months when official figures are released later.
The Prime Minister will detail her 12-point plan on negotiating Britain's exit from the European Union during a speech on Tuesday.
Police investigating the disappearance of Victoria Cherry, who was last seen in October 2015, have found a body.