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 Bloomberg Michael BloombergTop Democratic super PAC launches Florida ad blitz after Bloomberg donation The Hill's 12:30 Report - Presented by Facebook - Latest with the COVID-19 relief bill negotiations The Memo: 2020 is all about winning Florida MORE.

Never thought I’d see this. https://t.co/MlnARdwCbC — Brit Hume (@brithume) February 15, 2020

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.

Legendary journalist Sam Donaldson knows Mike has what it takes to take on Trump and beat him. Sam covered campaigns for 52 years, and this is the first time he's endorsed anyone. Welcome to #TeamBloomberg! pic.twitter.com/R24zUXXxRU — Team Bloomberg (@Mike2020) February 15, 2020

“We are in the grip ... of a sick, ignorant man,” Donaldson, a staunch critic of President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy 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."

I am really thrown off by seeing Sam Donaldson -- my former boss @ABC -- doing a political ad. This hurts all working reporters who are trying to prove to the public they aren't all liberal and biased. https://t.co/bBs6HneALJ — Emily Miller (@emilymiller) February 15, 2020

Bloomberg has been surging in the polls, leapfrogging Democratic 2020 rivals such as Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) and former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE to land in third place behind Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) and former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE, who has slipped considerably in recent weeks, in some recent national polls.