Trump to Congress: Syria strike was in 'vital national security interest' of US

President Trump on Saturday delivered his justification to Congress for ordering a missile strike on Syria this week, saying in a letter to congressional leaders that the U.S. was prepared to take further military action if necessary.

"I acted in the vital national security and foreign policy interests of the United States, pursuant to my constitutional authority to conduct foreign relations and as Commander in Chief and Chief Executive," Trump wrote.

"The United States will take additional action, as necessary and appropriate, to further its important national interests," he added.

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The letter was addressed to House Speaker Paul RyanPaul Davis RyanElection Countdown: Trump confident about midterms in Hill.TV interview | Kavanaugh controversy tests candidates | Sanders, Warren ponder if both can run | Super PACs spending big | Two states open general election voting Friday | Latest Senate polls On The Money: Midterms to shake up House finance panel | Chamber chief says US not in trade war | Mulvaney moving CFPB unit out of DC | Conservatives frustrated over big spending bills Nancy Pelosi: Will she remain the ‘Face of the Franchise’? MORE (R-Wis.) and Sen. Orrin HatchOrrin Grant HatchGrand Staircase-Escalante: A conservation triumph is headed for future as playground for industry McConnell tamps down any talk of Kavanaugh withdrawal GOP offers to ban cameras from testimony of Kavanaugh accuser MORE (R-Utah), the Senate president pro tempore.

Under the War Powers Resolution, the president is required to submit an explanation for the use of force within 48 hours after military action is taken. The deadline for Trump to do so would be Saturday night.

Trump's letter echoed his comments delivered roughly an hour after the strikes on Thursday night, when he characterized the strikes as in the "vital national security interest" of the U.S.

“It is in this vital national security interest of the United States to prevent and deter the spread and use of deadly chemical weapons,” Trump said at his Mar-a-Lago resort in Florida, where he was hosting Chinese President Xi Jinping.

A number of world leaders rallied around the U.S. strikes on Friday, applauding the action as a necessary and proportional response to Syrian President Bashar Assad’s alleged use of chemical weapons in the country’s Idlib Province.

The Syrian government and Russia, a longtime backer of Assad and one of the regime’s fiercest military supporters, condemned the strike. A spokesman for Russian President Vladimir Putin on Friday called the strike an act of “aggression against a sovereign state” and accused the U.S. of violating international law.

U.S. lawmakers expressed general support for the attack, though many called for the president to seek congressional approval before conducting any further military operations against Syria.

Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellKey GOP senators appear cool to Kavanaugh accuser's demand Trump hints at new executive action on immigration, wants filibuster-proof Senate majority The Hill's Morning Report — Sponsored by United Against Nuclear Iran — The Hill interviews President Trump MORE (R-Ky.), however, said that the president shouldn’t have to seek further approval for military action.

He argued that an Authorization for Use of Military Force (AUMF) approved by Congress in the days after the Sept. 11, 2001 attacks, and another in 2002 that authorized the Iraq War, justified recent military action in the region.

"We passed one back in 2001 and 2002, I believe, and the previous president thought that it authorized what we were doing in that part of the world, and I expect this president thinks the same," he told conservative radio host Hugh Hewitt on Friday.

Trump’s assertion that the U.S. was prepared to carry out further attacks on Syria if necessary echoed similar comments made by U.S. Ambassador to the United Nations Nikki Haley on Friday, who delivered a rebuttal to Russia’s condemnations and defended the president’s action.

"The United States took a very measured step last night," Haley said. "We are prepared to do more, but we hope that will not be necessary."

Updated: 3:51 p.m.