"Mr Trump scares me, scares the hell out of me to be quite frank with you," New York police commissioner Bill Bratton told CBS News a day after announcing that he would retire in September.
Bratton, who has spent 45 years in public service, said he did not "get" why the Republican nominee, whose home he has visited, commanded so much support.
"I'm amazed that veterans groups are so charmed by him," said the outgoing police chief, who himself served in Vietnam. "I've just watched this whole campaign and I just shake my head."
"I wonder if he's ever actually taken a punch in his life," Bratton told CBS.
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"There's no compassion there, it's all about him and never about anybody else. Strange times," said the police chief.
"I know many people who are, who are very strongly supportive of him, although they have questions. But again, it's troubling," he said.
President Barack Obama yesterday delivered a virtually unprecedented rebuke of a presidential nominee, calling Trump "unfit" to be president and called on Republican leaders to disown him.