Senators from both parties on the Foreign Relations Committee called Wednesday for an immediate briefing on the Trump administration's Iran policies and plans after the State Department announced it is pulling diplomatic personnel from Iraq amid rising tensions.

“There are only two reasons for ordering their departure: We have credible intelligence that our people are at risk, or in preparation for military action in Iran,” the panel’s top Democrat, Sen. Bob Menendez Robert (Bob) MenendezKasie Hunt to host lead-in show for MSNBC's 'Morning Joe' Senators ask for removal of tariffs on EU food, wine, spirits: report VOA visa decision could hobble Venezuela coverage MORE (N.J.), said at the top of a hearing on arms control agreements. “The Trump administration has not provided any information to this committee on the intelligence behind their decisions or what they plan to do in Iraq or Iran, and I have repeatedly reminded the administration of its responsibilities to this committee.

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“Mr. Chairman, I hope you’ll join me in asking the administration to immediately provide this committee with a briefing on the decision to order the departure of the embassy staff, the intelligence on what Iran may be planning to do and any plans to go to war with Iran,” Menendez continued, addressing 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).

Later in the hearing, Sen. Mitt Romney Willard (Mitt) Mitt RomneyBiden 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 The Memo: Trump's strengths complicate election picture MORE (R-Utah) backed Menendez’s call.

“I agree with the ranking member about the need for a classified briefing on the matters in Iraq and hope that the entire committee, or perhaps just the chair and ranking member, would be able to have that kind of briefing,” Romney said.

Risch replied to Romney that he has gotten a briefing and is working to arrange one for the full Senate.

“This is a very critical issue, there’s no question about that,” Risch said.

“Thank you, that gives me a heartened feeling,” Romney replied.

The State Department announced Wednesday morning that it is ordering the departure of non-emergency personnel at the U.S. Embassy in Baghdad and the U.S. Consulate in Erbil.

The order comes after the Trump administration has warned of unspecified threats to U.S. personnel from Iran. In response to those alleged threats, the military sped up the deployment of a carrier strike group the region and deployed a bomber task force, Patriot missile battery and amphibious transport dock.

On Tuesday morning, a British general who is the deputy commander of the U.S.-led coalition fighting ISIS in Iraq and Syria told Pentagon reporters there was no increased threat from Iranian-backed forces in those countries.

“There's been no increased threat from Iranian-backed forces in Iraq and Syria,” British Maj. Gen. Chris Ghika said at a Pentagon briefing.

Hours later, however, U.S. Central Command (Centcom) issued an unusual statement refuting Ghika’s comments.

“Recent comments from OIR's Deputy Commander run counter to the identified credible threats available to intelligence from U.S. and allies regarding Iranian backed forces in the region,” Centcom spokesman Capt. Bill Urban said in a statement. “U.S. Central Command, in coordination with Operation Inherent Resolve, has increased the force posture level for all service members assigned to OIR in Iraq and Syria.”

In his comments Wednesday, Menendez acknowledged a full Senate briefing is “rumored” for next week, but said that is not sufficient.

“That is no substitute for directly briefing the committee today when there is clearly actionable intelligence available, nor is that timeline itself acceptable,” he said.

Menendez also stressed that Congress has not authorized military action against Iran.

“If it were contemplating military action with Congress, it must come to Congress to seek approval,” Menendez said of the administration.

Menendez later added that while he “appreciate[s]” that Risch has been briefed, Democrats remain in the dark.

“I just hope that when it comes to something of such consequence, potential consequential significance, that we can be briefed, so we can understand what we’re dealing with,” he said.

Sen. Chris Murphy Christopher (Chris) Scott MurphyDemocratic senator calls for 'more flexible' medical supply chain to counter pandemics The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon GOP chairman to release interim report on Biden probe 'in about a week' MORE (D-Conn.), saying he shared Menendez’s “grave concern,” asked hearing witness Andrea Thompson, under secretary of State for arms control and international security, about details of the department’s announcement on personnel in Iraq. She said she did not have any because it is not part of her portfolio.

Sen. Jeanne Shaheen Cynthia (Jeanne) Jeanne ShaheenSenate Democrats introduce bill to sanction Russians over Taliban bounties Trump-backed candidate wins NH GOP Senate primary to take on Shaheen Democratic senator urges Trump to respond to Russian aggression MORE (D-N.H.) later asked Thomson whether she had been briefed at all on the announcement, to which she replied she had not.

“I think it’s important and a critical enough issue given the potential threat of war, that everybody on this committee and everybody in Congress should be briefed about that,” Shaheen said.

Sen. Rand Paul Randal (Rand) Howard PaulRand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts Health officials tell public to trust in science MORE (R-Ky.), meanwhile, pressed hearing witness David Trachtenberg, under secretary of Defense for policy, on whether the administration has the authority to wage war with Iran without congressional authorization.

Trachtenberg replied that only Congress has the authority to declare war.

“So the answer is the president can’t do it,” Paul said, “and that would be the answer I hope we would get from the policy person.”