President-elect Donald Trump is back to his Twitter complaints.

In a tweet posted Thursday night, Trump slammed the protests against his forthcoming presidency in cities across the country. “Just had a very open and successful presidential election. Now professional protesters, incited by the media, are protesting. Very unfair!” he wrote.

Just had a very open and successful presidential election. Now professional protesters, incited by the media, are protesting. Very unfair! — Donald J. Trump (@realDonaldTrump) November 11, 2016

It’s a return to form for Trump, who often expressed frustration with the media and political rivals on his Twitter account. His tweets since becoming president-elect on Tuesday, however, had remained tame. In fact, Trump just ten minutes before tweeted about a “good meeting” with President Obama in Washington, D.C.

Trump’s Twitter had often been a source of controversy in his campaign. While other presidential candidates largely had carefully curated Twitter accounts, Trump frequently let his unfiltered opinions run in his tweets. In a profile last week, the New York Times reported that Trump’s aides even took control of his Twitter account in the final days of his campaign.

Anti-Trump protests did indeed break out across the country on Wednesday, in large cities including New York, Chicago, Boston, Berkeley, Portland, Austin, and Los Angeles. In L.A., a march grew to thousands and 29 people were arrested for blocking the 101 freeway through downtown.