Yes, Trump did say that.
Of course, the context of Trump's statement, which you so conveniently omitted, was that he made that suggestion only for the case of a "protester" initiating an assault by throwing a missile at rally attendees or Mr. Trump himself.
Context is everything, so even if Donald Trump was "out of line" in making that statement, he certainly wasn't advocating the use of force against anyone who was being peaceable.
So color me unimpressed.
The salient point is that those who try to smear Donald Trump with such false accusations are being hysterical, and participating in the same reckless exaggeration that typifies the Establishment, the Left, and their mainstream media cohorts...