All of the centrist MPs who recently defected from Labour and the Conservatives failed to win seats.
The Liberal Democrat's Chuka Umunna rules out a pact with the current Conservative or Labour leaders.
Chuka Umunna says his party wants to "enhance" the UK's role in Nato.
The Lib Dem MP explains his party's plan for a general election.
- Copyright: AFP
Chuka Umunna, the Liberal Democrats' Shadow Foreign Secretary who leads on trade for the party, says the government's intervention over the £4bn Cobham takeover is "welcome but long overdue".
"We’ve been demanding for weeks that the government intervene in this transaction. Not only are there clear national security grounds to do so but it threatens to materially impact on our manufacturing base in this country."
The Lib Dem MP uses his first conference speech to attack Jeremy Corbyn and his supporters.
By Gavin Stamp
Political reporter, BBC News
By Peter Snowdon
Presenter of Radio 4's Splitters
By Iain Watson
Political correspondent, BBC News
Change UK MP Chuka Umunna says he has switched to the Liberal Democrats because he was "wrong" to think "millions of politically homeless people" wanted a new party.
The former Labour MP for Streatham told Today he had "massively underestimated just how difficult it is to set up a fully-fledged new party without an existing infrastructure".
- Copyright: AFP
Former Labour and Change UK MP Chuka Umunna has joined the Lib Dems.
The Streatham MP told the Timeshe had been "wrong" to think "millions of politically homeless people... wanted a new option on the ballot paper".
"I also think I vastly underestimated the importance of having an infrastructure and existing relationships with voters," he added.
He was one of six Change UK MPs to quit last week, after it gained only 3.4% of the vote in the European elections.