CNN host John King Wednesday tore into Democratic presidential candidate Joe Biden Joe BidenBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Democratic groups using Bloomberg money to launch M in Spanish language ads in Florida Harris faces pivotal moment with Supreme Court battle MORE on Wednesday after reports surfaced of a second accusation of plagiarism.

King, noting that similar reports derailed Biden’s 1988 presidential campaign, said it was a “pretty amateur mistake for the frontrunner’s campaign to make on a substantial policy rollout.”

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"Supposed to be a campaign ‘A-Team,’ this was not an ‘A’ performance,” King said, referring to Biden's team of campaign veterans.

“It’s lazy or it’s arrogant,” he continued said. "You would think he would be happy to quote progressive groups on his website."

King concluded that the incident was a "leadership issue" and "competence issue."

"He wants to be President of the United States, this is a leadership and competence issue. You can’t do this stuff. You just can’t,” King said.

King's comments came after The Washington Post reported earlier Wednesday that Biden's campaign may have lifted a passage from another source in putting together its education plan.

The former vice president's campaign was accused on Tuesday of plagiarizing passages from policy think thanks in putting together its climate change proposal. Biden's campaign acknowledged on Tuesday that it inadvertently lifted the passages.

Biden’s campaign has since added attribution to the policy plans in question.

Accusations of plagiarism plagued Biden's unsuccessful 1988 presidential campaign. He dropped out of the race after he was found to have lifted passages from others into his speeches.