McConnell 'distressed' over reasons for Mattis resignation

Senate Majority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellSunday shows preview: Shutdown negotiations continue after White House immigration proposal Senate to take up Trump's border-immigration plan next week Trump pitches new plan to reopen government amid Dem pushback MORE (R-Ky.) said he was "distressed" by Defense Secretary James MattisJames Norman MattisMacron: US 'retreat from Syria' won't change mission to eradicate ISIS Poll: Most Americans want US troops in Syria Fox's Griffin: Was told by diplomat that Syria attack was 'direct result' of US pullout decision MORE's resignation announcement Thursday.

“I believe it’s essential that the United States maintain and strengthen the post-World War II alliances that have been carefully built by leaders in both parties," McConnell said in a statement. "We must also maintain a clear-eyed understanding of our friends and foes, and recognize that nations like Russia are among the latter." 

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“So I was sorry to learn that Secretary Mattis, who shares those clear principles, will soon depart the administration. But I am particularly distressed that he is resigning due to sharp differences with the president on these and other key aspects of America’s global leadership," McConnell said. 

Thursday's statement is one of McConnell's more critical statements toward Trump since the president's inauguration.

For his resignation, Mattis sent a letter to President TrumpDonald John TrumpSunday shows preview: Shutdown negotiations continue after White House immigration proposal Rove warns Senate GOP: Don't put only focus on base Ann Coulter blasts Trump shutdown compromise: ‘We voted for Trump and got Jeb!’ MORE saying he deserved a secretary "whose views are better aligned with yours."

Mattie's announcement that he will resign in February came a day after the Trump administration announced it would be withdrawing the U.S. military presence from Syria and amid reports that the same may happen in Afghanistan.

Both of those moves have been met with opposition from Pentagon officials and members of the foreign policy establishment.

In his note, Mattis signaled concern with the way the president treated allies in NATO as well as rivals such as China and Russia. 

McConnell finished his statement by asking Trump to consider a replacement whose views align with Mattis's.

“It is regrettable that the president must now choose a new Secretary of Defense," McConnell wrote. "But I urge him to select a leader who shares Secretary Mattis’s understanding of these vital principles and his total commitment to America’s servicemembers."