WASHINGTON (AP) — President Donald Trump is threatening social media companies with new regulation or even closure after Twitter added fact checks to one of his tweets.

Claiming tech giants “silence conservative voices,” Trump tweeted Wednesday that, “We will strongly regulate, or close them down, before we can ever allow this to happen.”

The president can’t unilaterally regulate or close social media companies, as that would require action by Congress or the Federal Communications Commission.

Trump and his campaign are lashing out after Twitter on Tuesday added a warning phrase to two Trump tweets that called mail-in ballots “fraudulent” and predicted that “mail boxes will be robbed."

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