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 in an early morning tweet on Tuesday said that the State Department’s identification of “multiple security incidents” surrounding the handling of 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 is “really big.”

“Wow! The State Department said it has identified 30 Security Incidents involving current or former employees and their handling of Crooked Hillary Clinton’s Emails,” he said, tagging Fox News.

“This is really big. Never admitted before. Highly Classified Material," he added. "Will the Dems investigate this?”

Wow! The State Department said it has identified 30 Security Incidents involving current or former employees and their handling of Crooked Hillary Clinton’s Emails. @FoxNews This is really big. Never admitted before. Highly Classified Material. Will the Dems investigate this? — Donald J. Trump (@realDonaldTrump) June 18, 2019

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In a letter to Senate Finance Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyGOP lawmakers distance themselves from Trump comments on transfer of power The Hill's 12:30 Report: Ginsburg lies in repose Top GOP senators say Hunter Biden's work 'cast a shadow' over Obama Ukraine policy MORE (R-Iowa), the State Department said it had issued 23 violations and seven infractions, finding 15 unidentified individuals to be involved in Clinton’s use of a private email server.

The department said the letter to Grassley, who is leading congressional oversight of the security review, was issued as an update on the “lengthy” and “serious” investigation.

“Given the volume of emails provided to the Department from former Secretary Clinton's private email server, the Department's process has been necessarily more complicated and complex requiring a significant dedication of time and resources,” the letter reads.

The State Department’s review began after the FBI looked into Clinton’s use of a private server while serving as secretary of State.

While former FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE ultimately didn't bring any charges against her, he did say Clinton and her staff were "extremely careless in their handling of very sensitive, highly classified information."

Trump frequently spoke of Clinton’s private email use ahead of the 2016 presidential election, centering the deletion of 33,000 emails from the server.

He vowed that if he beat Clinton, the Democratic presidential nominee, he would order the Justice Department to prosecute her.

How long did it take your staff of 823 people to think that up--and where are your 33,000 emails that you deleted? https://t.co/gECLNtQizQ — Donald J. Trump (@realDonaldTrump) June 9, 2016

The State Department is expected to wrap up the probe by Sept. 1, and it said the number of violations and infractions issued “will likely change as the review progresses.”