President Trump and Big Tech companies have never really gotten along. But the president’s conflict with Silicon Valley escalated Tuesday evening when Twitter appended a “fact-check” with additional information to two of his tweets speculating about election fraud and mail-in ballots.

“Twitter is now interfering in the 2020 election,” Trump tweeted in a furious backlash. “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. Twitter is completely stifling FREE SPEECH, and I, as President, will not allow it to happen!”