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Former colleague Brit Hume on Sam Donaldson's Bloomberg endorsement: 'Never thought I'd see this'

Brit Hume, who once served as a White House correspondent for ABC News, said he "never thought" he would see his former colleague Sam DonaldsonSamuel (Sam) Andrew DonaldsonMSNBC's Nicolle Wallace says she'll 'gladly' vote for Sanders Former colleague Brit Hume on Sam Donaldson's Bloomberg endorsement: 'Never thought I'd see this' Sam Donaldson pens op-ed endorsing Bloomberg for president MORE endorse a political candidate after the longtime journalist announced his support for 2020 Democratic White House hopeful Michael BloombergMichael BloombergBiden's great challenge: Build an economy for long-term prosperity and security The secret weapon in Biden's fight against climate change Sanders celebrates Biden-Harris victory: 'Thank God democracy won out' MORE.

Donaldson, 86, served as ABC's White House correspondent from 1977 to 1989, before Hume, who is currently with Fox News, was awarded the job. Donaldson is best known for his clashes with former President Reagan during his two terms in the 1980s.

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In addition to announcing his endorsement of Bloomberg during an interview with CNN's Anderson Cooper on Friday night, the retired newsman also did an endorsement video for the former New York City mayor and billionaire's campaign that was released on Saturday.

“We are in the grip ... of a sick, ignorant man,” Donaldson, a staunch critic of President TrumpDonald John TrumpBiden team wants to understand Trump effort to 'hollow out government agencies' Trump's remaking of the judicial system Overnight Defense: Trump transgender ban 'inflicts concrete harms,' study says | China objects to US admiral's Taiwan visit MORE throughout his first three years in the White House, told Cooper on Friday.

“He’s mean, he’s corrupt and if we don’t get this right, we may lose the things that have made this country the best place to live in the world and that shining city on a hill that Ronald Reagan used to talk about that was the envy of the world,” Donaldson added.

Donaldson's endorsement was also criticized by journalist Emily Miller, who once worked under Donaldson at ABC News.

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"I am really thrown off by seeing Sam Donaldson -- my former boss @ABC -- doing a political ad," Miller wrote. "This hurts all working reporters who are trying to prove to the public they aren't all liberal and biased."

Bloomberg has been surging in the polls, leapfrogging Democratic 2020 rivals such as Sen. Elizabeth WarrenElizabeth WarrenOn The Money: Biden to nominate Yellen for Treasury secretary | 'COVID cliff' looms | Democrats face pressure to back smaller stimulus Biden to nominate Janet Yellen as Treasury secretary: report Bottom line MORE (D-Mass.) and former South Bend, Ind., Mayor Pete ButtigiegPete Buttigieg'Biff is president': Michael J. Fox says Trump has played on 'every worst instinct in mankind' Buttigieg: Denying Biden intelligence briefings is about protecting Trump's 'ego' Biden's win is not a policy mandate — he should govern accordingly MORE to land in third place behind Sen. Bernie SandersBernie SandersFive House Democrats who could join Biden Cabinet Biden names John Kerry as 'climate czar' in new administration In the final chapter of 2020, we must recommit to repairing our democracy MORE (I-Vt.) and former Vice President Joe BidenJoe BidenBiden team wants to understand Trump effort to 'hollow out government agencies' Overnight Defense: Trump transgender ban 'inflicts concrete harms,' study says | China objects to US admiral's Taiwan visit Protect our world: How the Biden administration can save lives and economies worldwide MORE, who has slipped considerably in recent weeks, in some recent national polls.