Robert Pattinson's reunion with Kristen Stewart has gotten under the skin of some, and that apparently includes Donald Trump.

He couldn't help but tweet some advice to Pattinson on Wednesday, presumably after catching wind of the news that the 26-year-old "Twilight" actor and his co-star Stewart, 22, have been hanging out.

"Robert Pattinson should not take back Kristen Stewart," Trump posted. "She cheated on him like a dog & will do it again--just watch."

Last week, sources whispered to People magazine that the two actors are indeed together again, and this week, they were spotted sharing a "look of love" outside of an L.A. bar.

"They seem attached to the hip again," an onlooker recently dished to People. "They spent all weekend together. They are back to hanging out with their old group of friends. Everything seems back to normal again."

Trump, for one, is not happy. Pattinson, he tweeted, "can do much better!"