President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE tweeted early Wednesday that former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE's emails were hacked and obtained illegally by China, warning that the Justice Department must act on the news or risk losing its credibility.

"Hillary Clinton’s Emails, many of which are Classified Information, got hacked by China," the president said in the tweet.

"Next move better be by the FBI & DOJ or, after all of their other missteps (Comey, McCabe, Strzok, Page, Ohr, FISA, Dirty Dossier etc.), their credibility will be forever gone!" he added.

Hillary Clinton’s Emails, many of which are Classified Information, got hacked by China. Next move better be by the FBI & DOJ or, after all of their other missteps (Comey, McCabe, Strzok, Page, Ohr, FISA, Dirty Dossier etc.), their credibility will be forever gone! — Donald J. Trump (@realDonaldTrump) August 29, 2018

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The president's tweet, which did not cite any evidence for the claim, comes following a report from The Daily Caller citing unnamed intelligence sources who said that Clinton's private email server was compromised by the Chinese, a fact it claims was discovered in 2015.

One unnamed intelligence source told the news outlet that Clinton's email server was compromised by a public company acting as a front for the Chinese government, which the source says inserted a line of code that sent a "courtesy copy" of every email to Chinese authorities.

“When [the Office of the Intelligence Community Inspector General] did a very deep dive, they found in the actual metadata — the data which is at the header and footer of all the emails — that a copy, a ‘courtesy copy,’ was being sent to a third party and that third party was a known Chinese public company that was involved in collecting intelligence for China,” the intelligence source said.

No U.S. intelligence officials have publicly confirmed the report, and it was unclear if Trump was making the claim based on information not reported in the story.

China denied the report in a statement to Reuters, and said it "firmly oppose[s]" cyberattacks and the theft of state secrets.

“This isn’t the first time we’ve heard similar kinds of allegations,” Chinese Foreign Ministry spokeswoman Hua Chunying said at a daily news briefing.

“China is a staunch defender of cybersecurity. We firmly oppose and crack down on any forms of internet attacks and the stealing of secrets,” she added.