Former Prime Minister Sir John Major has warned a minority Labour government propped up by SNP votes would be a "recipe for mayhem".
In a speech in the Midlands today, Sir John said it would lead to a "weak and unstable" administration which would wreck Britain's economic recovery.
The Tory party has a heart former Prime Minister John Major has said.
Throwing his support behind David Cameron's campaign Sir John said: "I gave my lifetimes work to the Conservative party because I know them from the inside and they do care and they do help. They may not wear their heart on their sleeve, but it beats just as strongly to help people as the heart of any other political party in this country."
SNP leader Nicola Sturgeon could present a potentially long-term problem for Labour.
Sir John will give a speech later today saying a Labour-SNP government would be "weak and unstable" and wreck Britain's economic recovery.