Disclaimer, I believe this was written in early 2018 based on some of the details he's written.
Here's some good selects: (he goes into more details supporting his beliefs in the article.)
A.) He lies. A LOT. Politifact rates 69% of the words he speaks as "Mostly False or worse"
B.) He's an authoritarian populist,
F.) He couldn't pass a 3rd-grade civics exam. He doesn't' know what he's doing.
G.) He behaves unethicaly and always has.
H.) He is damaging our relationships with our best international friends while kissing up to nations that do not have our best interests in mind.
J.) He behaves and has always behaved as an unabashed racist.
K.) He is systematically steamrolling regulations
L.) He speaks and acts like a demagogue.
M.) His choices for top positions have been horrendous.
O.) He does not have the temperament to lead this nation.
Q.) He's unqualified.
S.) He's a blatant hypocrite.
V.) He has one response to a differing opinion. Attack.
X.) He emboldens the worst among us.