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The former BBC war correspondent, who will cover the conflict from a studio for Five news, said he would have criticised the Government.

"The case has not been made for war and I think we are in breach of international law," he said.

"It is unfair on our troops to send them into a war without the support of the people.

"I find it extraordinary that both main parties are supporting a war that most of the people oppose."

Yesterday (Tuesday) President George Bush gave Saddam Hussein two days to leave Iraq or face an all-out conflict. Newspaper reports quoted Pentagon sources as saying a military strike could be launched as early as tonight. Saddam, who has been accused of stockpiling chemical and biological weapons, rejected America's demands and is expected to remain in Baghdad.

The stand-off came shortly after former cabinet minister Robin Cook quit.

Mr Osborne, the Tories' youngest MP, said the atmosphere among MPs was 'electric' on Monday as Labour tried to rally support.

"They were certainly the most dramatic events I have seen in the House of Commons," he said. "Robin Cook gave a powerful speech and received a standing ovation which is not strictly allowed." Mr Osborne called the Knutsford Guardian from outside the Commons and said he hoped to speak during the Iraqi debate.

As a new MP he may not be called for more than nine hours, but said he would wait to explain why he felt war was just.

"I wish our forces well and whichever side of the argument we are on we must all agree to support our troops," he said.