Publishing magnate Steve Forbes weighed in on the Republican presidential race Saturday and said that Trump would do well with unions, even if union leaders pull for a Democratic candidate.

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“[Union leaders] may endorse a Democrat like Hillary Clinton Hillary Diane Rodham ClintonHillicon Valley: FBI chief says Russia is trying to interfere in election to undermine Biden | Treasury Dept. sanctions Iranian government-backed hackers The Hill's Campaign Report: Arizona shifts towards Biden | Biden prepares for drive-in town hall | New Biden ad targets Latino voters FBI chief says Russia is trying to interfere in election to undermine Biden MORE, but the rank and file, a big chunk of them are going to go their own way," Forbes said on a radio interview with John Catsimatidis.

He also said a big part of Trump's appeal is his attitude in speeches.

"Trump, even as he criticizes and throws out charges and all that kind of thing, he always ends up on an upbeat note about the USA," Forbes said.

"People want that, people want to hear that. They're tired of all this gloom and doom, and 'the U.S. is going in a trash heap.'"

When asked for his opinion on the rest of the GOP field, the Forbes Magazine founder added that Marco Rubio Marco Antonio RubioFlorida senators pushing to keep Daylight Savings Time during pandemic Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Intelligence chief says Congress will get some in-person election security briefings MORE and Ted Cruz Rafael (Ted) Edward CruzLoeffler calls for hearing in wake of Netflix's 'Cuties' Health care in the crosshairs with new Trump Supreme Court list 'Parks and Rec' cast members hosting special reunion to raise money for Wisconsin Democrats MORE should seek to imitate Trump's rhetoric.

"Well Ted Cruz has got to get a, I think, more upbeat note. He's got some good ideas on gold, he's got some good ideas on taxes, but he's got to be a little more Reagan-esque in his speeches," he said.

"Rubio is trying to do that, he's getting better at it. I just wish he'd make his tax plan better, he's got the worst tax plan out there," Forbes added. "Better than what we have now, but not up to par with the other Republican candidates."