Trump Says 'Disloyal' Hillary Clinton Threw DNC Chair Debbie Wasserman Schultz 'Under a Bus' in Email Scandal

—ROANOKE, VA -- Donald Trump slammed Hillary Clinton as "disloyal" over the email scandal surrounding outgoing Democratic National Committee Chair Debbie Wasserman Schultz, saying that she "threw her under a bus."

In their first public appearance after the Republican National Convention, Trump, alongside running mate Indiana Gov. Mike Pence, commented for the first time Wasserman Schultz stepping down after emails emerged appearing to show her and other party officials helping Clinton in the primary.

“I just want to say that Debbie Wasserman Schultz -- I always knew she was highly overrated,” Trump said.

"But she just got fired. They said Debbie. You’re fired. Get out. Get out Debbie. Out. Boom.”

Wasserman Schultz, in fact, resigned, but that didn't stop Trump from blaming Clinton.

"How about that though for disloyalty from Hillary Clinton?” he asked.

"Debbie was totally loyal to Hillary and Hillary threw her under a bus and it didn't take her more than five minutes to make that decision. Man, I don't want her covering my back,” he said.

Trump was referring to a massive hack of DNC servers that show efforts by DNC officials to undermine Democratic candidate Bernie Sanders during the primary season. Those damaging emails have since been released by WikiLeaks, agitating Sanders supporters at the start of the Democratic convention in Philadelphia and prompting Wasserman Schultz's resignation, effective at the end of the week.

Trump claimed that Clinton knew that the DNC was conspiring against Sanders. "She knew it's a rigged system that Bernie Sanders never had a chance," he said. "He never had a chance."

The FBI said it is investigating a massive breach of the Democratic National Committee's computers, which sources and experts say was likely the work of government hackers in Russia. Trump seemed to applaud their efforts.

"She [Wasserman Schultz] worked very, very hard to rig the system. Little did she know that China, Russia, one of our many, many friends came in and hacked the hell out of us. Can you imagine? Can you imagine what they're hacking? I guarantee we'll find the 33,000 e-mails,” he said, referring to Clinton's own email scandal.

Trump also assailed Clinton's running mate, Tim Kaine, and his record from his time as governor of Virginia as evidence of “Clinton’s bad judgement.”

"So Hillary Clinton has bad judgement. She shouldn’t have picked this guy. Big mistake because he is the exact opposite of what all of the Bernie people want,” he said. He added, “Mike pence of Indiana has done an unbelievable job. Triple A bond rating, so many different things. Job creation. Top in virtually every category.”

And in his rebuttal of Clinton, he also referred to another Clinton VP contender, Elizabeth Warren, whom he’s coined “Pocahontas” for her claims of Native American heritage.

“Instead of picking somebody and you don’t have to go with Pocahontas, you don’t have to go that far," he said. "Who by the way who hasn’t done anything. She is the worst senator in the US senate. You know she has a fresh mouth other than that she’s got nothing going for her."

ABC News' Mike Levine contributed to this report.