"If she had got the majority she wanted, she would have been a supreme political colossus," he said.
Theresa May's U.K. election gamble backfires as Tories lose majority →
"Cameron's got them over a barrel," Mr. Fielding said of Mr. Clegg's Liberal Democrats because they joined the coalition as a junior party and need time in government to establish political credibility.
Clegg: Cameron's EU treaty veto 'bad for Britain' →