By Dion Nissenbaum 

WASHINGTON--U.S. lawmakers said the Obama administration and other nations must move quickly to contain the resurgence of extremist violence in Iraq and prevent that country's government from falling, saying the situation is sowing the seeds for the next 9-11-type terrorist attack.

Sen. Lindsey Graham (R., S.C.), urged the U.S. on Sunday to work with Iran to prevent Islamic militants from taking over Baghdad and establishing a broader grip on the Middle East.

Mr. Graham, a longtime critic of U.S. talks with Iran, said the potential collapse of Iraq's government makes it essential for Washington to coordinate with Iran to stop the march of Islamic fighters toward Baghdad.

"The seeds of 9-11 are being planted all over Iraq and Syria," Mr. Graham said on CBS's "Face the Nation."

Mr. Graham and House Intelligence Committee Chairman Mike Rogers (R., Mich.), said President Barack Obama must work with other Middle East nations to try to stop the momentum.

"We need to re-engage our Arab league partners in what has been a lack" of decision-making, Mr. Rogers said on Fox News Sunday. "This is an al Qaeda minded group that is using all the tactics of brutality. This is as dangerous as it gets."

Mr. Rogers said the greatest threat stems from the potential for "thousands" of Westerners and Americans currently in Eastern Syria and Iraq who hold Western passports to become radicalized and return home to inflict terrorist damage.

Mr. Graham, speaking on CNN's "State of the Union," compared the need to work with Iran to the U.S. working with Soviet leader Joseph Stalin during World War II to defeat Adolf Hitler and Nazi Germany.

"Why did we deal with Stalin? Because he was not as bad as Hitler," Mr. Graham said. "The Iranians can provide some assets to make sure Baghdad doesn't fall."

Iran directed elite forces to help defend Baghdad as the Islamic State of Iraq and al-Sham, or ISIS, seized major cities in northern Iraq and marched south toward the nation's capital.

Mr. Graham said he could envision a situation where U.S. air power was used to help Iran work with Iraq to beat back the militant threat posed by the Sunni-led militant group.

The U.S., he said on CBS's "Face the Nation," has to establish a "red line" with Iran: "Don't use this crisis to take territory from the Iraqi people. Put them on notice that we will not accept their intervention in Iraq for the purpose of creating a satellite state for Iran."

Iran's Shiite government has a vested interest in bolstering the Shiite-led government in Baghdad led by Prime Minister Nouri al-Maliki. Mr. Maliki has been accused of marginalizing Iraq's Sunni majority, which dominated the country's politics under President Saddam Hussein until the U.S. invasion forced him from power in 2003.

Write to Dion Nissenbaum at dion.nissenbaum@wsj.com

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