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

Rep. Adam KinzingerAdam Daniel KinzingerFirst release from Fox News Books reaches No. 2 on Amazon top-seller list GOP lawmaker says colleagues 'waiting' for Trump to come to terms with loss GOP lawmaker: Trump implementing a 'loyalty purge' amid firing of top cybersecurity official MORE (R-Ill.), an Air Force veteran, ripped President TrumpDonald John TrumpTrump rages against '60 Minutes' for interview with Krebs Cornyn spox: Neera Tanden has 'no chance' of being confirmed as Biden's OMB pick Pa. lawmaker was informed of positive coronavirus test while meeting with Trump: report MORE for Defense Secretary James MattisJames Norman MattisBiden under pressure to remove Trump transgender military ban quickly Progressive House Democrats urge Biden against Defense chief with contractor ties Trump fires Defense chief Mark Esper 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.