Biden expresses shock that Trump considers attending Russia May Day event

Democratic presidential candidate Joe BidenJoe BidenBudget official says he didn't know why military aid was delayed: report Growing 2020 field underscores Democratic divide READ: Foreign service officer Jennifer Williams' closed-door testimony from the House impeachment inquiry MORE expressed surprise after he learned that President TrumpDonald John TrumpGOP divided over impeachment trial strategy Official testifies that Bolton had 'one-on-one meeting' with Trump over Ukraine aid Louisiana governor wins re-election MORE was thinking about attending Russia's May Day event next year

After being told the news by a reporter, Biden said "Are you serious?" according to a clip posted Saturday by CNN

"You're kidding me," the former vice president added. "Are you joking?"

Trump indicated Friday that he would like to accept Russian President Vladimir Putin's invitation to the May Day Parade in Moscow, but said he might not because it is during the presidential campaign season. 

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“It’s a very big deal, celebrating the end of the war,” Trump told reporters. “I appreciate the invitation. It’s right in the middle of the political season.”

White House hopeful Kamala HarrisKamala Devi HarrisNew poll catapults Buttigieg to frontrunner position in Iowa Growing 2020 field underscores Democratic divide Harris gets key union endorsement amid polling plateau MORE (D-Calif.) also jabbed at Trump over the matter, tweeting, "Always nice to spend time with supporters on the campaign trail."

Trump has faced scrutiny over his relationship with Russia, including after he said it was "possible" he would invite Putin to next year's Group of Seven summit.

The Justice Department's investigation into Russian interference in the 2016 election also found that  Russia aimed to help Trump win the contest, but did not establish that the Trump campaign conspired with Moscow.