Joe Biden formally launched his bid for the presidency Thursday with a video in which he criticized President Trump's response to the 2017 Charlottesville white supremacist rally.

The former vice president and longtime U.S. senator unsuccessfully ran for the party's nomination in 1988 and 2008, but is now seen by some pundits as the Democrats' best chance to defeat President Trump in 2020. 

"The core values of this nation, our standing in the world, our very democracy, everything that has made America -- America -- is at stake. That’s why today I’m announcing my candidacy for president of the United States," Biden said in a video to launch his campaign. 

Biden recalled Trump's "very fine people on both sides" remark following the rally in Charlottesville, Virginia, two years ago, where a white nationalist drove his car into a crowd of counter-protesters, killing a woman.

"In that moment I knew the threat to this nation was unlike any I had ever seen in my lifetime," Biden said.

Responding on "Fox & Friends First," Fox News political analyst Gianno Caldwell said Biden's reference to Charlottesville was "fairly disgusting" and a divisive tactic.

"I thought immediately that Joe Biden was running to be the divider-in-chief instead of the uniter-in-chief," he said, adding he was very disappointed with Biden's decision to bring up the "wound" opened by the events in Charlottesville.

Democrat Capri Cafaro, a former Ohio state senator, said she's always been a fan of Biden, but she felt he made a "misstep" by painting the race as "good versus evil."

"He's basically saying, Trump supporters, you're on the side of evil," said Cafaro.

Watch the full discussion above.

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