Sen. Kamala Harris Kamala HarrisTexas Democratic official urges Biden to visit state: 'I thought he had his own plane' The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements A game theorist's advice to President Trump on filling the Supreme Court seat MORE (D-Calif.) on Friday suggested that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE was going to spend time with "supporters" after the president said he was considering going to Russia's May Day Parade next year.

"Always nice to spend time with supporters on the campaign trail," the 2020 presidential hopeful tweeted in reference to Trump's comments, jabbing at him over his relationship with Russia.

Always nice to spend time with supporters on the campaign trail. https://t.co/dCGncnhqZr — Kamala Harris (@KamalaHarris) November 8, 2019

Trump indicated Friday that he would like to accept Russian President Vladimir Putin Vladimir Vladimirovich PutinWatchdog confirms State Dept. canceled award for journalist who criticized Trump Former intelligence agency director Robert Cardillo speaks out against 'erratic' Trump Kremlin: Putin calls for reset between US and Russia on cyber relations before elections MORE's invitation to the May 9 event, 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.”

Former special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's report of his investigation into Russia's election interference, released earlier this year, found that Russia aimed to help Trump win the 2016 election, but did not establish that there was a criminal conspiracy by the Trump campaign.

Trump has faced criticism for his closeness with Putin, including after he said it was "possible" he would invite Putin to next year's Group of Seven summit.

Harris is among more than a dozen people running for the 2020 Democratic presidential nomination.