The Liberal Democrats should either back or sack their leader Nick Clegg at next week's party conference in Brighton, one of his former advisers has said.
Mr Reeves, who served as director of strategy, said the Deputy Prime Minister could not avoid the question about his future as the party's leader. But the 43-year-old warned the Lib Dems that if they decide to back the Deputy Prime Minister, they must stick with him.
Writing in the New Statesman, Mr Reeves, who has since left the UK to live in the United States with his family, said: "The mutterings have been growing louder for months, certainly since another bruising round of local election results in the spring.
"The question of Clegg's leadership has to be addressed. Indeed, given the party's current position, it would be irresponsible not to do so.
"It is some comfort that David Cameron is facing similar squalls in his own party: at least now the necessary pain of coalition is being shared.
"Cards on the table: I think the party must stick with Clegg, and that Clegg must stick with both liberalism and coalition. Once the party caravan packs up on 26 September and heads inland after conference, the muttering has to stop. If the party is not to sack Nick Clegg then it must back him."