The government has called for a leak inquiry following fresh revelations concerning defence secretary Geoff Hoon.

According to media reports a committee of MPs will tomorrow accuse Geoff Hoon of "misleading" MPs over the Iraq dossier row.

The leaked parliamentary intelligence and security committee report alleged that Hoon ignored advice from senior civil servants.

It went on to say that he incorrectly denied that Ministry of Defence and intelligence officials were unhappy about the dossier's content.

The leak has led to renewed speculation about the future of the embattled minister.

Quizzed on the revelations, Tony Blair repeatedly denied that Number 10 had leaked contents from the report.

"If he actually has evidence that somebody from Downing Street has put this report into the newspapers, perhaps he would produce it now because I believe that to be completely untrue," he told Iain Duncan Smith.

The committee's findings landed on the prime minister's desk yesterday morning and were leaked on the eve of their release to MPs.

Following opposition calls Downing Street said it would order an investigation into the source of the leak.

Describing the committee's conclusions as "thoughtful", Number 10 had initially said it was "better to wait" for the release of the full report.

Shadow foreign secretary Michael Ancram said the charges against Hoon were "very serious".

"Such a leak is a very serious matter. Of all committees, the intelligence and security committee is the only one whose reports have to be vetted, edited and censored by the prime minister before publication,'' he said.

"An urgent investigation must be instituted. Once again, the Downing Street machine appears to be manipulating reports of parliamentary committees."

The latest revelations, contained in the Evening Standard newspaper, put fresh pressure on the embattled defence secretary.

The report was also expected to claim that Hoon withheld information from the committee as it attempted to unravel claims that Alastair Campbell exaggerated intelligence to strengthen the case for war.

The committee is expected to say that the document "was not sexed-up" by the Downing Street communications chief.

But it is likely to say that single source intelligence claiming Iraq could deploy its weapons within 45 minutes should never have been included.

The committee's report is also expected to unreservedly clear Campbell.

It is also likely to raise fresh doubts about the veracity of reports by BBC reporter Andrew Gilligan.

That is likely to lead to renewed speculation about the futures of both Gilligan and Hoon.

The report follows an earlier report from the foreign affairs committee which challenged Gilligan's account of events.

Hoon is already under pressure following an appearance before the Hutton inquiry.

The defence secretary gave an account of events which was later contradicted by his closest aide.

Richard Taylor, the minister's special adviser, claimed Hoon chaired a meeting at which the strategy which led to the unmasking of Dr David Kelly as the suspected BBC source was discussed.

Hoon had earlier denied being involved in the decision to name Dr Kelly as the possible source of the "sexed up" intelligence claims.

Speculation will now centre on whether Hoon decides to resign ahead of the report from the Hutton inquiry.

Some suggest the minister may tender his resignation following the formal report from the intelligence committee tomorrow.

That would then leave the prime minister more exposed once Lord Hutton delivers his findings later this year.

Following the leak, opposition MPs questioned whether Hoon could remain in post.

Menzies Campbell MP, Liberal Democrat foreign affairs spokesman, said: "If these report are true, then it is difficult to see how Mr Hoon can survive.

"It looks as if the government will be cleared by the intelligence and security committee of deliberately misleading the public. But the charge of incompetence looks likely to stick."