Trust him to do what? I trust him to do what he thinks is in his own best interest.
So far as "trust" goes, I will have to quote the immortal words of captain Jack Sparrow.
LOL. I pick the honest man, which Trump is not. That doesn't mean you should trust anyone but God Almighty 100%. Neither does it require me to not acknowledge any good thing the man does. It is not about people and personalities.
I'll answer your quote with this one:
"In selecting men for office, let principle be your guide. Regard not the particular sect or denomination of the candidate, look to his character. The scriptures teach that rulers should be men who rule in the fear of God, able men, men of truth, hating covetousness. It is to the neglect of this rule that we must ascribe the multified frauds, breaches of trust, and embezzlement of public property which tarnish the character of our country and disgrace government. When a citizen gives his vote to a man of known immorality, he abuses his civic responsibility, he sacrifices not only his interest, but that of his neighbor; he betrays the interest of his country."
Noah Webster, 1823