In the latest row over air capacity in the South, the former Environment Minister, has goaded David Cameron, by asking if he was "man or mouse." Tim Yeo has urged the Prime Minister to approve expansion at Heathrow.
He insists the environmental objections to a third runway are disappearing. He also claimed backing the move would give the Government a "sense of mission".
But the scheme remains a controversial one - with Conservative London Mayor Boris Johnson also opposing a third runway. Instead, he continues to push for a new airport in the Thames Estuary.
Transport Secretary Justine Greening told the BBC Radio 4 Today Programme it "would be difficult" for her to sit on a Cabinet that supported a third runway at Heathrow Airport.
A senior Tory MP has goaded David Cameron over the expansion of Heathrow airport, urging him to decide if he is "a man or a mouse.
Tim Yeo, the former environment minister, insists that environmental objections to controversial calls for a third runway are disappearing and claimed backing the move would give the Government a "sense of mission".
In a stinging attack Mr Yeo, who chairs the Commons Energy Committee, questioned whether the Prime Minister would preside "over a dignified slide towards insignificance" and suggested the leader's heart was "impenetrable" to most voters