Shortly after Sen. Lindsey Graham issued a series of spectacular insults aimed at his former Republican presidential challengers—one of which included the line, “If you killed Ted Cruz on the floor of the Senate, and the trial was in the Senate, no one would convict you”—Graham endorsed the Texas senator for president. On the Daily Show on Wednesday, he tried his best to explain why.

“I’m on the Ted train, absolutely,” Graham told host Trevor Noah, grinning and seemingly aware of his own bullshit. “What’s not to like?”

Noah then ran the clip of his memorable Cruz diss, and asked why things have changed. Smiling ruefully, Graham said, “It tells you everything you need to know about Donald Trump.” He later laughed, “I’m gettin’ better at this.”

Graham proceeded to basically call out the entire Republican Party, which he called “absolutely screwed up,” even warning Noah to prepare accordingly if Trump were to make it to the White House.

“If Trump wins, your days are numbered, pal,” he said. “Young, black, liberal guy from Africa is not going to work with him.”