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“She's as crooked as they come, she had a little bad news today as you know from some reports came down weren't so good,” Trump told the packed crowd.
According to the State Department's inspector general, Clinton and some of her predecessors violated the government's policies on email use and records retention.
The department's investigative office offered the conclusion in a report released on Wednesday to members of Congress and obtained by ABC News.
The report examined the email practices of five U.S. secretaries of state and found that there was "a limited ability to retrieve email records, inaccessibility of electronic files, failure to comply with requirements for departing employees and a general lack of oversight."
Clinton spokesman Brian Fallon said that her use of email was consistent with her predecessors and that political opponents were misrepresenting the findings.
As he often does, Trump continued associating Clinton with her now former boss, President Obama.
"Let me tell you something if she wins -- and I hope she doesn't -- but if she wins you better get used to it because you'll have nothing but turmoil and you'll have nothing but four more years of Obama years of Obama and you can't take that.”
In recent weeks, as Massachusetts Sen. Elizabeth Warren has become more involved in the Clinton campaign, Trump has made her more of a target. The two have often had spats on Twitter.
"I was being hit by everybody. I was being hit by the Republicans. I was being hit by Pocahontas. Pocahontas, Pocahontas that's Elizabeth Warren. I call her goofy. No no Goofy, She gets less done than anybody in the United States senate,” he said.
Trump has used the Pocahontas moniker because of Warren's claims that she has Native American ancestry.
And like last night in New Mexico, today’s event in California found itself the target of protesters: According to the Anaheim Police Department, 7 adults and 1 juvenile were arrested; the charges are not known yet.
Trump will remain in California today where he will attend a private fundraiser and make an appearance on ABC’s "Jimmy Kimmel Live”