(CNN) Responding to a volley of critical tweets and comments from Jeb Bush, Donald Trump on Monday called his rival -- the son of one president and brother of another -- an "embarrassment to his family."

Moments earlier, Bush told CNN's Dana Bash he was a "joyful warrior," who wouldn't sit back and watch "someone try to hijack a party that I believe will allow people to rise up again."

Trump, who had been watching Bush's interview, fired back immediately, launching a series of aggressive attacks and insults at the former Florida governor.

"Jeb is having some kind of a breakdown," he told CNN's Wolf Blitzer. ​"He's an embarrassment to his family. He has to bring his mother out and walk his mother around at 90 years old. I think it's a very sad situation that's taking place."

"Frankly, he's a stiff," Trump said. "He's not a guy who can be president. He doesn't have what it takes to be president."

Read More