An impeachable offense: Trump Calls For ‘Rough’ Policing, Gives Blessing To Law Enforcement Abuses – Talking Points Memo

Inciting police to violate the rights of persons in custody is an impeachable offense.
Constitution of the United States of America:

Article II, Section 1 "Before he enter on the execution of his office, he shall take the following oath or affirmation:--"I do solemnly swear (or affirm) that I will faithfully execute the office of President of the United States, and will to the best of my ability, preserve, protect and defend the Constitution of the United States."
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Article II, Clause 3 the President "shall take care that the laws be faithfully executed".

Trump Calls For ‘Rough’ Policing, Gives Blessing To Law Enforcement Abuses – Talking Points Memo
"The address, in Brentwood, New York, was ostensibly meant to address the violence propagated by the MS13 gang. But, amid repeated raucous cheering and “thank yous” from the officers in attendance, Trump veered into several extended monologues on the value of being “tough.”

Toward the end of his remarks, the President gave a chilling example of what he meant.

“When you see these towns, and when you see these thugs being thrown into the back of a paddy wagon, you just see them thrown in, rough,” he said, referring to the arrest of alleged gang members. “I said, please don’t be too nice.”

“When you guys put somebody in the car and you’re protecting their head, you know, the way you put their hand over,” he mimicked an officer putting a handcuffed person in the back of a squad car, the officer’s hand over the suspect’s head. “Like, don’t hit their head and they’ve just killed somebody? Don’t hit their head?”

“I said, you can take the hand away, OK?” he concluded, to laughter, and then loud applause.

That sentiment characterized much of the red meat speech, in which Trump contrasted himself frequently to his predecessor.

“We have your backs 100 percent,” Trump said near the beginning of his remarks. “Not like the old days."