Staying true to the many criticisms he’s lobbed against GOP presidential nominee Donald Trump, Texas Sen. Ted Cruz gave a speech at the Republican National Convention Wednesday night in which he refused to endorse Trump for president.

Waves of disbelief rippled throughout the Cleveland arena immediately after Cruz's speech, with many audience members booing him off the stage. The Texas senator was also criticized by his fellow Republican Party members, including fellow former 2016 presidential candidate Chris Christie who called Cruz “selfish.”

Firing back, Cruz's campaign manager Jeff Roe threw out a zinger during an interview on the Chris Stigall Show, saying the New Jersey governor “turned over his political testicles long ago.”

He added, “So I don’t take what he has to say with any meaning. You know, he embarrassed himself pretty quickly in this.”

Roe told host Chris Stigall that Trump was aware in advance that Cruz wasn’t going to endorse him in his speech Wednesday. Roe said:

Mr. Trump made a call two days ago to Ted and wished him luck at the convention and on his speech, asking him for an endorsement and Ted directly declined. And Mr. Trump heard that. And then we submitted the speech at 6:31 and there was some back and forth, they clearly would’ve liked us to go further and there was discussions had as recently as walking on the stage and we delivered the speech and 95% of the way through the speech the active whip operation got active and started demanding to endorse and booing and it obviously got sideways at the end.

Roe also implied that it was possible Trump's camp encouraged delegates to boo Cruz during his speech after he learned the Texas senator wasn't going to provide an endorsement. When asked for clarity, Roe responded:

There were certainly people being ginned up to boo. But this isn’t a whining moment at all. This isn’t a whining moment at all. It was their convention. Do I think they laid some perfectly executed trap? I think, you know, because the standing ovation at the beginning was so long. We had a 12 minute slot. You know, I think the speech went 21 minutes, a full 6 of that was applause , both unknown that there would be that much standing ovation at the beginning for that long and then of course the end was not anticipated.