President Donald Trump slammed NBC and Saturday Night Live again over the weekend, accusing the network and its long-standing sketch comedy show of being “unfair” and even potentially illegal.

“A REAL scandal is the one sided coverage, hour by hour, of networks like NBC & Democrat spin machines like Saturday Night Live,” Trump tweeted Sunday morning. “It is all nothing less than unfair news coverage and Dem commercials. Should be tested in courts, can’t be legal? Only defame & belittle! Collusion?”

Trump’s mention of a “scandal” likely refers to his irritation with the media’s coverage of the many controversies that have engulfed him and that have sparked investigations. Over the weekend, SNL mocked Trump in its “cold open” sketch with a parody of the classic Christmas movie It’s A Wonderful Life. The black-and-white skit imagined what life would have been like if Trump hadn’t been elected president, specifically looking at how different the lives of his associates like Michael Cohen (played by Ben Stiller), Kellyanne Conway (played by Kate McKinnon) and Supreme Court Justice Brett Kavanaugh (played by host Matt Damon) would be in this alternate universe. Alec Baldwin returned to play the president for the segment.

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Trump has previously gone after SNL and Baldwin in the past, especially since the 60-year-old actor began playing him in the show’s 42nd season, just weeks before the 2016 election.

On CNN on Sunday, Brian Stelter and correspondents Joan Walsh and Oliver Darcy weighed in on Trump’s attacks on NBC and SNL. Walsh cited the First Amendment and noted that the sketch comedy show is purely satire and that it has made fun of almost every president and major political figure since it began in 1975, not simply Trump.

Trump hosted SNL in November 2015, just five months after announcing his bid for president.