Mattis is a great guy, awesome general who served our country with honor and distinction.
However he was also a very status quo person in my impression.
TRUMP is about to turn over tables, Allies included (DECLAS) and I think Mattis doesn't want to be around for that ass whoopin'
Also Mattis 2 times convinced TRUMP to strike a sovereign nation based on bad intel IMO
if anything this means we are going to get more of the TRUMP we voted for which is the KICK globalist ass and FUCK shit up TRUMP!