Donald Trump capped off the week of the Republican National Convention on Friday by delivering a speech that focused ― if that can ever be the right word for a Trump event ― on Sen. Ted Cruz (R-Texas) not offering the candidate an official endorsement.

“I don’t want his endorsement,” Trump said. “If he gives it, I will not accept it.”

“He should’ve done it, because nobody cares, and he would’ve been in better shape for four years from now ― I don’t see him winning anyway, frankly ― but if he did, it’s fine,” he added.

Cruz was booed off the stage at GOP convention on Wednesday when he declined to endorse Trump during his speech. Cruz has stood by his decision, citing the business mogul’s personal attacks during the primary campaign.

“I am not in the habit of supporting people who attack my wife and attack my father,” he said.

Trump continued his speech by directing a few words at the senator: “Stay home, relax, enjoy yourself.”

If Cruz was indeed relaxing at home watching the speech, he saw what came next: Trump again attacked Cruz’s father. He revived a charge he first brought up in May, when he said Cruz’s father may have been involved ― maybe, somehow, sort of ― in the assassination of former President John F. Kennedy.

“I know nothing about his father,” Trump said Friday. “I know nothing about Lee Harvey Oswald. But there was a picture on the front page of the National Enquirer, which does have credibility, and they’re not going to do pictures like that because they get sued for a lot of money if things are wrong, a lot of money, and there was a picture, and that’s the only thing I know.”

Trump: I don’t want Ted Cruz’s endorsement. “If he gives it, I will not accept it.” https://t.co/wXVccSEqVv https://t.co/VRDf85dfbs

— CNN (@CNN) July 22, 2016

Just moments after he said he didn’t care about getting an endorsement from Cruz, Trump mused that he might start a super PAC to attack Cruz if the senator decided to launch a presidential campaign in four years.

“Are you allowed to set up a super PAC, Mike, if you are the president?” he asked his running mate, Indiana Gov. Mike Pence, in front of the cameras. Pence correctly shook his head no.

Trump later mentioned the “governor of Ohio” ― a reference to John Kasich, who ran against Trump in the GOP primary and has said not endorsing the nominee is a “matter of conscience.”

“You have no choice,” Trump said. “You’ve gotta go for Trump.”