WASHINGTON ― Senate Democrats are furious that the Trump administration held a briefing for lawmakers on Wednesday about U.S. military strikes on suspected drug boats in the Caribbean Sea and only invited Republican senators to attend.

“What the administration did in the last 24 hours is corrosive not only to our democracy but downright dangerous for our national security,” Sen. Mark Warner (D-Va.), the top Democrat on the Senate Intelligence Committee, told reporters on Thursday, warning that the move set a “troubling precedent” that had trampled on the longheld bipartisan tradition of bipartisan briefings of Congress on U.S. military activities abroad.

“They know they screwed up,” Warner added of Trump’s White House. “And where in the hell were my Republican senators, whom we have worked on everything [with] in a bipartisan fashion? Why didn’t they say, ‘Isn’t this a little bit weird they don’t have any Democrats in the room?’”

The U.S. military killed 14 people in missile strikes against alleged drug cartel boats in the Eastern Pacific earlier this week, part of nearly a dozen attacks on vessels off the coast of Venezuela in recent months. Critics have called the use of force unconstitutional since it lacks congressional authorization. Lawmakers on both sides of the aisle have pressed for more information about the strikes, including their legal justification.

The briefing was held for Republican senators who sought more information on the strikes and included a memo from the White House Office of Legal Counsel on their legal justification. Democrats have been pressing for similar information but have been rebuffed by the White House.

Several GOP senators sided with Warner on the matter, urging the Trump administration to brief Democrats on the military strikes as well. Republicans know that freezing Democrats ought of a briefing on matters of war could come back to bite them in the future under a Democratic presidential administration.

Sen. Mike Rounds (R-S.D.), a member of the Senate Intelligence Committee who had attended the briefing, said the decision not to invite members of both parties was “unfortunate.” Sen. Lindsey Graham (R-S.C.) also said that Democrats “absolutely” need to be included.

“It’s very important that everybody’s briefed,” he added.

Warner said that U.S. Secretary of State Marco Rubio, who served alongside Warner as chair of the Senate Intelligence Committee before joining the Trump administration, “looked me in the eye and personally promised” in a meeting last week to share legal justification for the boat strikes.

“But instead … this administration chose to give this sensitive legal document to a select group of more than a dozen Republican senators,” he said.

Sen. Tim Kaine (D-Va.), a leading advocate of Congress’ constitutional role in deciding when the nation goes to war, also said he couldn’t believe Democrats had been shut out of the briefing.

“I don’t deserve to be treated like an annoyance, an obstacle or an enemy by the Pentagon,” Kaine, a member of the Senate Armed Services Committee, said Thursday.

CORRECTION: This story has been amended to accurately reflect Kaine’s political party.