Former Romney official endorses Clinton
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One of Mitt Romney’s original national finance committee chairs says he is voting for Hillary ClintonHillary Diane Rodham ClintonFBI’s top lawyer believed Hillary Clinton should face charges, but was talked out of it Harris adds key Clinton aide, women of color to 2020 campaign: report Democrats more likely Trump's foil, than to foil Trump MORE rather than Donald TrumpDonald John TrumpJustice Department preparing for Mueller report as soon as next week: reports Smollett lawyers declare 'Empire' star innocent Pelosi asks members to support resolution against emergency declaration MORE.

“I have decided to endorse and support Hillary Clinton for president, even though everybody else I will vote for this November will be a real Republican,” David Nierenberg wrote in a Friday op-ed for CNBC.

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“Hillary Clinton knows her stuff,” he added of the Democratic presidential nominee. "She is emotionally mature and centered. She respects and enjoys working with people from all backgrounds. 

“She has the diplomatic skills needed to break the gridlock in Washington and lead our country well. America needs a steady hand on the tiller.”

Nierenberg, who first worked with Romney in 2006, said Trump is the exact opposite of what America needs.

“Trump is the most dangerous major party presidential candidate in my lifetime, maybe in American history,” he said. "His character, temperament and behavior are definitely not presidential.

“I don’t think he’s fit to be our president,” Nierenberg added of the GOP nominee. "He speaks positively about foreign dictators and acts like one himself.

“This year, however, watching and listening to Donald Trump’s erratic daily bullying, ranting, bragging, scapegoating and name-calling, my conscience and my three adult children will not let me vote for him.”

Nierenberg added Trump must publicly release his tax returns, echoing Romney’s past criticism of the billionaire.

“For decades, candidates, including successful business people, have released their tax returns; why does Trump think he shouldn’t follow the rules of the game? Defeating him has to be our national priority.”

Romney, the GOP’s 2012 presidential nominee, has repeatedly criticized Trump and refused to endorse the real estate tycoon.

Clinton’s campaign, meanwhile, launched an initiative last week touting support from current and former Republican officials.

Several Republicans have announced they oppose Trump as their party’s nominee amid multiple controversies surrounding the businessman.