An aide to Speaker John BoehnerJohn BoehnerLobbying World 'Ready for Michelle' PACs urge 2020 run News Flash: Trump was never going to lock Clinton up MORE (R-Ohio) warned the White House on Monday it must consult with congressional leaders before taking any military action in Syria.

BoehnerJohn BoehnerLobbying World 'Ready for Michelle' PACs urge 2020 run News Flash: Trump was never going to lock Clinton up MORE spokesman Brendan Buck said in a blog post that the president was obligated to “consult with Congress on the options he sees as a viable response.”

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“This consultation has not yet taken place, but it is an essential part of the process,” Buck continued. “And meaningful consultation should happen before any military action is taken.”

Buck also demanded that the president “explain his decision publicly, clearly and resolutely” if he decides to act.

“More than just to Congress, the president has an obligation to the American people to explain the rationale for the course of action he chooses; why it’s critical to our national security; and what the broader strategy is to achieve stability,” Buck wrote.

Secretary of State John KerryJohn KerryIran’s nuclear deal just the tip of the iceberg for Trump Trump needs to stand firm on immigration, 'religious-test' insticts Budowsky: Ellison, Kerry to DNC? MORE on Monday laid out the case for airstrikes against Syria, arguing that country's government had undeniably used chemical weapons. He also said the administration was "actively consulting" with members of Congress. 

Earlier on Monday, Sen. Bob CorkerBob CorkerLawmakers eye early exit from Washington Trump: 'Almost all' Cabinet picks coming next week Overnight Defense: Trump reportedly picking Mattis for Defense chief MORE (R-Tenn.) told MSNBC that an American “response is imminent” in Syria.

“I talked last evening in the situation room and we’re building support with NATO allies,” Coker said. “Our assets are in place. I don’t think there’s any question in our administration’s mind that chemical warfare has been used.”

—This story was posted at 1:36 p.m. and updated at 3:22 p.m.