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Danny Alexander has said the Liberal Democrats will not support a minority Labour or Tory government after the next election.
Speaking on a visit to the Channel Tunnel, the Chief Secretary to the Treasury insisted that a minority government would "not be in the national interest".
The comments from the senior Liberal Democrat come as some Conservatives have said they would prefer a minority government to another Coaltion, should there be a hung parliament in 2015.
Mr Alexander told the BBC that a minority government would not be in the national interest because it "would not be able to take the difficult decisions that still need to be taken in the next parliament to keep our economy on track".
He added: "It is not what the Lib Dems want. It is not what we would be arguing for."
But he said the Lib Dems could form a Coalition with either Labour or the Tories.
"If there is a balanced Parliament after the next election, I want the Lib Dems to be part of the coalition government. We would seek to work with whichever party, Labour or Conservatives, had the strongest mandate from the electorate," he said.
Mr Alexander also refused to rule out one day running for leadership of his party.
"Nick Clegg has said that he wants to carry on his leadership for the whole of the next Parliament. I support that very strongly," Mr Alexander said.
But he added: "I will cross that bridge if it comes."
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