And the president’s treatment of our allies….
And the president’s affinity for authoritarian regimes…

https://www.nytimes.com/2018/12/20/us/politics/jim-mattis-defense-secretary-trump.html

Officials said Mr. Mattis went to the White House on Thursday afternoon in a last attempt to convince Mr. Trump to keep American troops in Syria, where they have been fighting the Islamic State. He was rebuffed, and told the president that he was resigning as a result.

Hours later, the Pentagon released Mr. Mattis’s resignation letter, in which he implicitly criticized his commander in chief. Mr. Mattis said in the letter that he believes that the president deserves a defense secretary who is more in tune with his worldview.

“One core belief I have always held is that our strength as a nation is inextricably linked to the strength of our unique and comprehensive system of alliances and partnerships,” Mr. Mattis wrote.

“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,” he wrote.

His departure leaves the Trump administration without one of the few officials viewed as standing between a mercurial president and global tumult. The president said he would name Mr. Mattis’s replacement shortly.