Hewlett Packard CEO and top GOP fundraiser Meg Whitman will become the first Republican to hit the campaign trail for Hillary Clinton on Tuesday.

Whitman, who endorsed Clinton earlier this month, will meet with Colorado business leaders in Denver to discuss the Democratic nominee’s jobs plan, according to the Denver Post.

The HP executive has vocally criticized Donald Trump, calling him a “demagogue” who has “exploited anger, grievance, xenophobia and racial division.”

Whitman told the New York Times in August that to prevent his election she would pour all her energy into supporting Clinton.

“I will vote for Hillary, I will talk to my Republican friends about helping her, and I will donate to her campaign and try to raise money for her,” Whitman said.

The Times reported that the former secretary of state reached out to Whitman personally to seek her endorsement.

Other prominent Republican businesspeople supporting Clinton’s bid include Silicon Valley venture capitalist Marc Andreesen and former Goldman Sachs CEO and Treasury Secretary Henry Paulson. A slew of former GOP elected officials, writers and strategists have also vowed to support her campaign.