Ed Miliband should not be sucked into a pact with the Liberal Democrats and instead show the courage to rule on a minority government, Unite General Secretary Len McCluskey said.
"Labour, I hope, win the next election outright, but if they are the biggest party then my view is Ed should have the courage of his convictions and govern on a minority government," , Mr McCluskey said in an interview with the BBC's Newsnight programme.
"My view is that Ed shouldn't be sucked into a Lib/Lab pact he should have the courage of his convictions if we are the largest party, he should govern.
"And he should challenge those coalition parties to bring him down if necessary and go back to the people so that there's a stark alternative."
More top news
Showers turning wintry across the higher ground, accompanied by a widespread frost
Several police were injured after violence erupted in Baltimore today after the funeral of a man who died in police custody.
Bournemouth all but sealed promotion to the top-flight for the first time in their history with a 3-0 win against Bolton.