The U.S. military blocked a Russian troll farm’s Internet access to protect the 2018 midterm elections — a move approved by President Trump, according to a new report.

The U.S. Cyber Command conducted the operation against the Internet Research Agency, a company based in St. Petersburg that was charged by special counsel Robert Mueller for meddling during the 2016 election. The operation against the Russian troll farm, which is funded by an oligarch with ties to Russian President Vladimir Putin, signified the first cyber campaign designed to counter Russian interference in a U.S. election, several U.S. officials told the Washington Post.