Meg Whitman, a Republican fundraiser and Hewlett-Packard Enterprise CEO, will campaign for Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE on Tuesday in Denver.

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Whitman will meet with business leaders in Colorado to discuss Clinton’s job-creation plan, as well as investments in tech and small business, according to a release from Clinton’s campaign.

Earlier this month, Whitman, who unsuccessfully ran for governor of California in 2010, announced she would back Clinton over GOP nominee Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE and promised she would give a “substantial” contribution to the former secretary of State’s campaign.

Whitman said she doesn’t agree with Clinton on many issues, but slammed Trump as “a dishonest demagogue” and said he has “undermined the character of the nation.”

“Time and again history has shown that when demagogues have gotten power or come close to getting power, it usually does not end well,” Whitman said in an interview with The New York Times.

Whitman is one of a growing number of Republicans who have bucked Trump and have instead decided to support and vote for Clinton in November. The list of GOP defectors includes many national security officials and former aides who worked in George W. Bush’s administration.