D.C. Metropolitan Police Department spokesman Paul Metcalf confirmed to NFL Media on Monday that Morgan was arrested early Sunday morning and booked on one charge of misdemeanor simple assault.
The wide receiver told WRC-TV that he's innocent of any wrongdoing.
"I didn't touch him," Morgan said Monday. "I didn't do anything. This is crazy. I'm not worried about nothing.
"I have always been a stand-up guy in the community. Nothing like this has ever happened to me before."