Lawmakers emerging from a closed-door briefing on Iran on Thursday warned the threat of U.S. military action is increasing after a U.S. drone was shot down.

House Foreign Affairs Committee Chairman Eliot Engel Eliot Lance EngelHouse panel halts contempt proceedings against Pompeo after documents turned over Engel subpoenas US global media chief Michael Pack 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-N.Y.) said no decisions on military action were presented at the briefing — delivered by administration officials to congressional leaders — but that “it’s a very grave situation."

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“The provocation on behalf of the Iranians is serious,” he said. “I think right now there’s strong analysis going on as to exactly what happened and why, and I think we’ll know more when the analysis is completed.”

“I fear military action because I don’t want to get into a war,” Engel added. “We’ll have to see.”

But some lawmakers who have President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE’s ear were blunt about what they think needs to happen.

“Here’s what Iran needs to get ready for: Severe pain inside their country,” Sen. Lindsey Graham Lindsey Olin GrahamSteele Dossier sub-source was subject of FBI counterintelligence probe Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Key Democrat opposes GOP Section 230 subpoena for Facebook, Twitter, Google MORE (R-S.C.) told reporters. “If they’re itching for a fight, they’re going to get one. We’re a lot closer to that today than we were yesterday, and only god knows what tomorrow brings.”

Graham said he spoke with Trump on Thursday morning and has plans to speak with him again in the afternoon.

On Wednesday night, an Iranian surface-to-air missile shot down an unarmed U.S. Navy RQ-4A Global Hawk surveillance drone operating in international airspace above the Strait of Hormuz, according to Central Command.

U.S. Air Forces Central Command chief Lt. Gen. Joseph Guastella added later in another statement that the U.S. drone was operating about 21 miles from the nearest point of land off the Iranian coast at the time it was shot down.

“This was an unprovoked attack on a U.S. surveillance asset that had not violated Iranian airspace at any time during its mission,” Guastella said to Pentagon reporters in call from Qatar in which he took no questions. “This attack is an attempt to disrupt our ability to monitor the area following recent threats to international shipping and free flow of commerce.”

Iran has said the U.S. drone was operating over the Hormozgan Province in southern Iran.

Trump tweeted Wednesday morning that Iran “made a big mistake” by shooting down the drone.

Asked later if he planned to strike Iran, Trump said the public “will soon find out.”

But Trump also appeared to give Iran some benefit of the doubt when assigning blame for the incident, saying that “I imagine someone made a mistake.”

Iran has also recently said it will exceed on June 27 the limit on the amount of uranium it is allowed to stockpile under the international nuclear deal. It has also threatened to increase the level of enrichment of its uranium, bring it closer to weapons-grade.

On Thursday, Graham said if Iran follows through with its threat on uranium, Israel will be forced to respond over time, “and we’ll follow.”

Graham added that Trump needs to respond to the drone incident or else risk losing credibility.

“We had told the Iranians before they shot the drone down, if you engage against American personnel or assets you do so at your own peril,” Graham said. “The president does not want war with Iran or anybody else, but he is the commander in chief.”

Republican leaders from the House similarly said it is important to respond.

“I think it’s important for us to stand up to Iran and to make it clear that we’re not going to allow them to America or American allies,” House Minority Whip Steve Scalise Stephen (Steve) Joseph ScaliseHouse GOP slated to unveil agenda ahead of election House panel details 'serious' concerns around Florida, Georgia, Texas, Wisconsin elections Scalise hit with ethics complaint over doctored Barkan video MORE (R-La.) said. “It wasn’t a wise move by Iran to take this aggressive action, and they just put us in a position where we have to look at wider options to respond."

Scalise said he would not “speculate on what the president will do,” but that Trump is examining his options.

House Minority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy says there will be a peaceful transition if Biden wins GOP lawmakers distance themselves from Trump comments on transfer of power McCarthy claims protests in Louisville, other cities are 'planned, orchestrated events' MORE (R-Calif.), a close Trump ally who attended the briefing, deferred to the president on what the proper response should be.

“I think the president will have options before him like any other situation. They will measure the options and make a decision,” McCarthy said.

But he firmly denounced Iran for downing the drone.

“It’s unacceptable to shoot down an American UAV [unmanned aerial vehicle] in international waters. It is unacceptable for any country to do that. Iran knows that is unacceptable,” McCarthy told reporters.

“Iran has a long history of terrorist play, and that is unacceptable to the world and the world is not safe when Iran continues to have that behavior.”

Scott Wong contributed