Thomas Gunderson via Facebook
Gunderson, one of more than 500 injured in the mayhem of the Sunday night massacre, posted a video of the interaction on Facebook where he commented: "I will never lie down when the president of this great country comes to shake my hand!"
Gunderson was recovering from a fresh gunshot wound to the leg.
"Hey, this guy looks tough to me," Trump said as he entered the room.
Watch the video posted by Gunderson below: