Sen. Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.) says he and other lawmakers haven’t been adequately briefed by the Trump administration about the growing threat posed by Iran amid growing tensions between Washington and Tehran.

Graham, the chairman of the State and Foreign Operations Appropriations Subcommittee and a top ally of President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's, said senators have been largely kept in the dark as the U.S. sends an aircraft carrier strike group and bombers to the Middle East.

“No, I feel we haven’t been well informed and I’m writing a letter with Sen. Leahy today to try to get a briefing,” Graham said Wednesday afternoon, referring to Sen. Patrick Leahy Patrick Joseph LeahyDemocrats shoot down talk of expanding Supreme Court Battle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election MORE (Vt.), the ranking Democrat on the State and Foreign Operations Subcommittee.

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“I don’t think it’s fair for us to walk around wondering,” he said, reflecting broader concerns among Senate GOP colleagues about the fast-moving events in the Middle East.

Asked about the threat posed by Iran and a report by The New York Times that acting Defense Secretary Patrick Shanahan Patrick Michael ShanahanHouse Armed Services chairman expresses confidence in Esper amid aircraft carrier coronavirus crisis Boeing pleads for bailout under weight of coronavirus, 737 fallout Esper's chief of staff to depart at end of January MORE has drawn up a plan to send as many as 120,000 troops to the Middle East, Graham said, “I don’t know.”

“I just know what I read. The president has said it wasn’t true,” he said, pointing to Trump's comments the previous day disputing the report.

But Graham said he’s concerned by the State Department’s decision to partially evacuate the U.S. Embassy in Baghdad in response to intelligence of possible Iranian-backed threats.

“We’re clearly moving people,” he said. “This is a big deal.”

“We had people there during the height of the war,” Graham said of the embassy in Iraq. “I was there a bunch of time getting rocketed. If we could stay in operation then [during the height of the Iraq War] it must be some kind of real threat.”

Other Republican colleagues share Graham’s concerns.

“There should be more briefings. I think we should have that sooner rather later. I’ve talked to the administration about that,” said Sen. Cory Gardner Cory Scott GardnerCook Political Report shifts Colorado Senate race toward Democrat Overnight Health Care: US coronavirus deaths hit 200,000 | Ginsburg's death puts future of ObamaCare at risk | Federal panel delays vote on initial COVID-19 vaccine distribution The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting MORE (R-Colo.), a member of the Foreign Relations Committee.

Senators say they expect the administration to brief them next week, but some worry that could be too late.

“My understanding is there will be [a briefing] by early next week but I don’t know where we’re going to be by early next week. I hope I’m wrong, we could be full blown into this thing. It’s a much more urgent situation than I think is being reflected. I’m surprised there isn’t more talk about it,” said Sen. Marco Rubio Marco Antonio RubioOvernight Defense: Pentagon redirects pandemic funding to defense contractors | US planning for full Afghanistan withdrawal by May | Anti-Trump GOP group puts ads in military papers Democrats step up hardball tactics as Supreme Court fight heats up Press: Notorious RBG vs Notorious GOP MORE (R-Fla.), a member of the Senate Intelligence Committee.

Senate Foreign Relations Committee Chairman Jim Risch James (Jim) Elroy RischWhy the US should rely more on strategy, not sanctions Davis: The Hall of Shame for GOP senators who remain silent on Donald Trump Senators blast Turkey's move to convert Hagia Sophia back into a mosque MORE (R-Idaho) said he received a briefing from administration officials on Iran but that many of his colleagues are still in the dark.