Lawmakers are getting mixed signals from the Trump administration on war authorization.

On Wednesday, top Trump administration officials indicated that there was no need for a new war authorization bill but would not oppose the creation of one.

Defense Secretary James Mattis James Norman MattisBiden courts veterans amid fallout from Trump military controversies Trump says he wanted to take out Syria's Assad but Mattis opposed it Gary Cohn: 'I haven't made up my mind' on vote for president in November MORE and Secretary of State Rex Tillerson Rex Wayne TillersonGary Cohn: 'I haven't made up my mind' on vote for president in November Kushner says 'Alice in Wonderland' describes Trump presidency: Woodward book Conspicuous by their absence from the Republican Convention MORE briefed the Senate Foreign Relations Committee in a closed-door meeting to discuss the 2001 authorization for the use of military force (AUMF) passed in the wake of the 9/11 terrorist attacks.

The 2001 AUMF provides legal justification to fight against al Qaeda and the Islamic State in Iraq and Syria (ISIS), but a group of lawmakers is now pushing for a more tailored war authorization bill, arguing the old one should no longer apply.

Foreign Relations Committee Chairman Bob Corker Robert (Bob) Phillips CorkerHas Congress captured Russia policy? Tennessee primary battle turns nasty for Republicans Cheney clashes with Trump MORE (R-Tenn.) told reporters after the meeting that he expects the administration to continue working with the committee on the issue despite telling him it’s “not seeking” a new AUMF.

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“They wouldn’t be opposed to one that’s written in the appropriate way,” Corker said. “Secretary Mattis was very helpful in talking through some of the caveats that they have. I’m confident they’ll work with us. They’re not seeking one, but I think they saw that there’s an effort to try to do something.”

Mattis in March endorsed a new AUMF while speaking at a Senate Appropriations defense subcommittee hearing, criticizing lawmakers for not stepping in sooner to create an updated authorization.

But the administration earlier on Wednesday contradicted that message by sending a letter to Corker asserting the Trump administration “is not seeking revisions to the 2001 AUMF or additional authorizations to use force.”

The country already has “sufficient legal authority” to prosecute the war against ISIS, wrote Charles Faulkner of the State Department’s Bureau of Legislative Affairs.

Sen. Jeff Flake Jeffrey (Jeff) Lane FlakeRepublican former Michigan governor says he's voting for Biden Maybe they just don't like cowboys: The president is successful, some just don't like his style Bush endorsing Biden? Don't hold your breath MORE (R-Ariz.) emerged from the briefing more confident in the push for a new AUMF.

“I feel, frankly, better about it now than I did before, and I felt good going in,” he said.

Flake also brushed off the State Department letter. For one, it’s similar to what the Obama administration’s stance on the issue was, he said. And it’s unlikely an administration would admit it doesn’t have the proper legal authorities to fight an ongoing war, he added.

“But Secretary Mattis is on record publicly saying it would be useful to have that, and that’s what we’ve always said,” he said. “Congress and the administration on matters like this should speak with one voice.”

Flake and Sen. Tim Kaine Timothy (Tim) Michael KaineBiden promises Democratic senators help in battleground states Second GOP senator to quarantine after exposure to coronavirus The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Va.) have crafted legislation to repeal the 2001 AUMF, replacing it with a more specific bill to target ISIS that would automatically sunset after five years. Congress would be able to expedite reauthorization before it expires.

Kaine was also positive after the meeting, telling reporters it was “very productive” despite a difference in opinions.

“The administration believes, as did the previous administration, that they have the legal authority to conduct the military operations they’re conducting,” Kaine said. “That’s nothing new, but the administration [also] believes ... 16 years after the 9/11 authorization it would be a good idea to do it again.”

Kaine added that the secretaries were “very open to the idea of working on an authorization, not because they feel like they legally have to have it, but they think for the mission itself it would good to have Congress engaged with the fight.”

Lawmakers on both sides of the aisle appear to have taken different meanings from the conversation.

Sen. Cory Booker (D-N.J.) said he thinks the administration “has no choice” but to work with Congress on the AUMF, even as his colleague 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.) expressed concerns that there was “an unbridgeable difference between the administration and many members of this committee.”

“They don’t believe they need an authorization, many of us believe they do,” Murphy told reporters. “They expressed a willingness to work on an authorization and I take them at their word. I’m not sure that we can bridge all the differences that we have in the committee on what that authorization would look like.”

Sen. Robert 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 (D-N.J.) echoed that sentiment, noting that the secretaries were open to a new AUMF, but under terms and conditions that would be so open-ended “that would be very difficult to support.”

Sen. Christopher Coons Christopher (Chris) Andrew CoonsBiden promises Democratic senators help in battleground states Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep MORE (D-Del.) said Mattis and Tillerson “did not specifically reject” Flake and Kaine’s AUMF legislation, but also said, “I’m not sure that we’ll be able to get there.”

There also appeared to be some confusion as to how the conversation would continue.

“I don’t know if we need a public [AUMF] hearing or not,” Corker said.

The committee's ranking Democrat, Sen. Ben Cardin Benjamin (Ben) Louis CardinPPP application window closes after coronavirus talks deadlock Congress eyes tighter restrictions on next round of small business help Senate passes extension of application deadline for PPP small-business loans MORE (Md.), however, believes a public hearing with Mattis and Tillerson “would be helpful.”