Expectations were low when he took over in 2017, but Brexit has put the wind back in the party's sails.Read more
Political reporter, BBC News
After press reports of two Tory MPs defecting to the Lib Dems, Sir Vince Cable says the real "measure of success is whether the voters defect".
The Liberal Democrat leadership hopefuls are asked how they can appeal to Leave voters.
The Liberal Democrat leader answers questions sent in by BBC News viewers ahead of the European Parliamentary elections.