LONDON (IRNA) -- An influential group of British MPs are urging Prime Minister Tony Blair to use his influence to keep U.S. President George W. Bush involved in finding a diplomatic solution to Iran's nuclear program.

"We recommend that the Government use its close relationship with the USA to encourage it to engage further with Iran," the Foreign Affairs Select Committee said.

"We conclude that U.S. engagement will be an essential component of any lasting agreement and commend U.S. involvement in the current EU3 diplomatic initiative," it said.

In its latest wide-ranging report on Foreign Aspects of the War against Terrorism published on Sunday, the all-party group of MPs said that it also commended the high-level cooperation between the United Kingdom, France and Germany in their negotiations with Iran.

It called on the UK government to set out "steps it is taking" to keep the U.S. involved in negotiations to find a diplomatic solution over the concern about Iran's civilian nuclear program.

"In the interest of legitimacy as well as effectiveness, the maximum international consensus is desirable on any action taken against Iran," the report said. It highlighted the "deep skepticism over the likelihood of a Security Council consensus on imposing sanctions as has been borne out by the persistent failure to agree a Security Council Resolution."

In view of some of the belligerent rhetoric from Israel as well as some elements in Washington, the MPs also warned that any military action "would be likely to unleash a host of extremely serious consequences both in the Middle East and elsewhere."

"The Government should not undertake or support military action against Iran until all other options have been exhausted or without broad agreement among its international allies," they said in slight reference to Blair's unilateral support for the U.S.-led Iraq war.

"We recommend that the Government make this point absolutely clear to the administration in Washington," their report further emphasized.