Donald Trump likes winning, but he doesn't like to participate in a fair competition. Since he was a child, Trump has had things rigged for him and he will throw a tantrum if he doesn't get his way.
All of the non-Trump candidates seeking the GOP nomination have dropped out except for Haley. While Haley lost in New Hampshire last night, it makes sense for her to stay in the race. Trump is facing serious legal jeopardy and he seems less healthy every day.
Trump is frustrated that Haley hasn't dropped out of the race yet, even after her loss in New Hampshire. He gave an unhinged 'victory' speech where he insulted his opponent and at one point threatened her with investigations if she didn't drop out of the race.
"Just a little note to Nikki," he said, "she's not going to win. But if she did she would be under investigation by those people in 15 minutes. I could tell you five reasons why already, not big reasons, little stuff that she doesn’t want to talk about, but she will be under investigation in minutes."
The former President also threw a dig at Ron DeSantis too, saying, "And so would Ron have been, but he decided to get out."