Former Vice President Joe Biden is been hammered over fresh plagiarism allegations after his presidential campaign was ordered to update its climate platform amid complaints that the team took lines from at least five outside sources without giving credit.

Republicans responded by accusing Biden of committing the same offense that hindered his 1988 presidential campaign.

President Trump called it a “big problem,” tweeting from Europe Wednesday, drew more attention to the story.

“Plagiarism charge against Sleepy Joe Biden on his ridiculous Climate Change Plan is a big problem, but the Corrupt Media will save him,” Trump said.

Plagiarism charge against Sleepy Joe Biden on his ridiculous Climate Change Plan is a big problem, but the Corrupt Media will save him. His other problem is that he is drawing flies, not people, to his Rallies. Nobody is showing up, I mean nobody. You can’t win without people! — Donald J. Trump (@realDonaldTrump) June 5, 2019

The Republican National Committee labeled Biden a serial plagiarist.

“This is not Joe Biden’s first brush with plagiarism,” said the RNC’s Steve Guest. “During his 1988 campaign, Biden plagiarized campaign speeches from British Labour Party leader Neil Kinnock as well as Robert Kennedy. During law school, Biden plagiarized, too.”

This is not Joe Biden's first brush with plagiarism. During his 1988 campaign, Biden plagiarized campaign speeches from British Labour Party leader Neil Kinnock as well as Robert Kennedy. During law school, Biden plagiarized too. https://t.co/rFneLwO3CR — Steve Guest (@SteveGuest) June 4, 2019

The Biden campaign on Tuesday claimed it was a mistake.

“Several citations, some from sources cited in other parts of the plan, were inadvertently left out of the final version of the 22 page document,” the campaign told news outlets. “As soon as we were made aware of it, we updated to include the proper citations.”

The mainstream media have been adamant to refer to it as blatant plagiarism.

“We’re supposed to be mad at Biden because he copied a few lines of his climate plan from environmental groups?” tweeted Michael Grunwald, a writer for Politico. “That’s not ‘plagiarism.’ That’s ‘agreeing.’”

We're supposed to be mad at Biden because he copied a few lines of his climate plan from environmental groups? That's not "plagiarism." That's "agreeing." "https://t.co/E2lR2oOuFB — Michael Grunwald (@MikeGrunwald) June 4, 2019

Conservatives fired back with claims that the media are letting Biden off the hook.

“Trying to imagine a conservative getting caught plagiarizing and having it characterized simply as ‘lifting language,’” tweeted Matt Whitlock, an adviser to the National Republican Senatorial Committee.

Trying to imagine a conservative getting caught plagiarizing and having it characterized simply as “lifting language.” https://t.co/nbfSa5E0Zj — Matt Whitlock (@mattdizwhitlock) June 5, 2019