A microblogging and social networking service allegedly meddled in the upcoming election by declaring that some of the president’s posts are factually incorrect.

On May 26, President Donald Trump used his Twitter account to reject the Democratic Party’s proposal to allow postal voting through the U.S. Postal Service at the 2020 general election.

The president expressed serious concerns about the Electoral Commission’s ability to maintain the integrity of posted ballots and the social media company flagged them as incorrect.

“There is no way (zero) that mail-in ballots will be anything less than substantially fraudulent,” he said on Twitter. “Mail boxes will be robbed, ballots will be forged, and even illegally printed out and fraudulently signed.”

He pointed to California where Democratic Gov. Gavin Newsom was sending “millions” of ballots across the Golden State regardless of their voter registration status.

“That will be followed up with professionals telling all of these people, many of whom have never even thought of voting before, how, and for whom, to vote,” he said on Twitter. “This will be a rigged election. No way.”

However, Twitter tagged the posts with exclamation marks and inserted the words “get the facts about mail-in ballots” with a link to media coverage on the issue.

On the fact-check webpage, the headline of the top story from CNN reported the president made an “unsubstantiated claim” that mail-in ballots would lead to voter fraud.

Below the story, Twitter provided a summary of facts users “need to know” using information collected from media outlets that have been highly critical of the Oval Office.

“Trump falsely claimed that mail-in ballots would lead to a ‘rigged election,'” the social media company said in a statement. “However, fact-checkers say there is no evidence that mail-in ballots are linked to voter fraud. Trump [also] falsely claimed that California will send mail-in ballots to ‘anyone living in the state, no matter who they are or how they got there.’ In fact, only registered voters will receive ballots. Five states already vote entirely by mail and all states offer some form of mail-in absentee voting, according to NBC News.”

The flagging prompted the president to express concern that Twitter might be moderating content to change the outcome of the election to be held on Nov. 3.

“Twitter is now interfering in the 2020 presidential election,” the president said on Twitter. “They are saying my statement on mail-in ballots, which will lead to massive corruption and fraud, is incorrect, based on fact-checking by ‘fake news’ CNN and the Amazon Washington Post.”