Trump also said at a rally in Texas on Friday that he wished someone had taken down the armed gunman.

"If we had people with the bullets going in the opposite direction — right smack between the eyes of this maniac," Trump said, pointing to his forehead. "If some of those wonderful people had guns strapped right here, right to their waist or right to their ankle, and this son of a bitch comes out and starts shooting, and one of the people in that room happened to have it and goes boom, boom, you know what? That would have been a beautiful, beautiful sight, folks. That would have been a beautiful, beautiful sight."

Those previous comments were widely reported as support from Trump for armed clubgoers.

Trump's latest tweet came a day after the National Rifle Association's (NRA) top lobbyist and political strategist said on Sunday that he didn't want to see armed people drinking at clubs.

"No one thinks that people should go into a nightclub drinking and carrying firearms. That defies common sense. It also defies the law. It's not what we're talking about here,” Chris Cox, executive director of the NRA Institute for Legislative Action, said on ABC's "This Week."