Story highlights Whitman is in Utah for Mitt Romney's annual Experts and Enthusiasts summit

Trump has occasionally drawn comparisons to Hitler during his campaign

Washington (CNN) Billionaire and major Republican donor Meg Whitman on Friday compared Donald Trump to Adolf Hitler and Benito Mussolini, two sources in the room told CNN.

The Hewlett-Packard CEO's remarks at Mitt Romney's Utah retreat of top Republican supporters and fund-raisers came as she and news anchor Campbell Brown grilled House Speaker Paul Ryan over his endorsement of Trump. Ryan, unlike several other prominent GOP officials at the retreat, chose to endorse him but has simultaneously sought to distance himself from Trump's rhetoric about minorities.

The sources said Whitman was referring to Trump's rhetoric within a historical context.

In response, Trump told CNN he doesn't want Whitman's support, though he didn't respond to her references to Hitler and Mussolini.

"I never met Meg Whitman, but the job she is doing at Hewlett-Packard is not a very good one," he said in a statement via his spokeswoman, Hope Hicks. "Based on the disastrous campaign she ran in California, and the tens of millions of dollars she wasted, I have learned a lot from her. I do not want her support."