Twitter and Facebook on Thursday placed warning labels on President Donald Trump’s latest posts on mail-in-voting, in which he suggested that voters should show up at polling places and vote in person if their mail-in ballots had yet to be counted.

“We placed a public interest notice on two Tweets in this thread for violating our Civic Integrity Policy, specifically for encouraging people to potentially vote twice,” Twitter posted, quoting Trump’s tweet thread. “The laws regarding the invalidation of mail-in ballots when individuals choose to vote in person are complex, and vary significantly by state. Our goal is to prevent people from sharing advice about voting twice, which may be illegal.

“To protect people on Twitter, we err on the side of limiting the circulation of Tweets which advise people to take actions which could be illegal in the context of voting or result in the invalidation of their votes,” Twitter added, saying that the tweet will remain up but that other users will not be able to like, reply to or retweet it.