GOP lawmaker hits Trump after news of Mattis resignation: ‘That’s what happens when you ignore sound military advice’

Rep. Adam KinzingerAdam Daniel KinzingerTensions between the United States and Russia over Venezuela increase Booker, Gabbard to make appearances with Colbert The Hill's 12:30 Report: Cohen back on the hot seat MORE (R-Ill.), an Air Force veteran, ripped President TrumpDonald John TrumpButtigieg on Mueller report: 'Politically, I'm not sure it will change much' Sarah Sanders addresses false statements detailed in Mueller report: 'A slip of the tongue' Trump to visit Japan in May to meet with Abe, new emperor MORE for Defense Secretary James MattisJames Norman MattisTrump learns to love acting officials Shanahan says he's 'never favored' Boeing as acting Defense chief Trump moves to install loyalists MORE's announcement he will resign in February due to disagreements with the president.

“That’s what happens when you ignore sound military advice,” Kinzinger tweeted.

Trump and Mattis were known to disagree on a multitude of issues, including Trump’s stances toward NATO and Russia, banning transgender troops from serving in the military, canceling joint U.S.-South Korea military exercises, withdrawing from the Iran nuclear deal and deploying troops to the U.S.-Mexico border. 

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The defense secretary acknowledged the disagreements in his letter, saying his views did not match the those of the commander in chief.

“Because you have the right to have a Secretary of Defense whose views are better aligned with yours on these and other subjects, I believe it is right for me to step down from my position,” Mattis wrote in a resignation letter devoid of any praise for Trump.

Mattis's departure has long been expected after accounts of disagreements with Trump became more widespread and the president suggested a staff shakeup was imminent following November’s midterm elections. 

However, in his tweets announcing the departure, Trump heaped praise on Mattis.

“During Jim’s tenure, tremendous progress has been made, especially with respect to the purchase of new fighting equipment. General Mattis was a great help to me in getting allies and other countries to pay their share of military obligations. A new Secretary of Defense will be named shortly. I greatly thank Jim for his service!” he said.