Documentary filmmaker Michael Moore trolled President Trump on Saturday with a tweet calling him the "so-called president" — a jab at Trump's earlier attack on a "so-called judge" who ruled against his executive order on immigration.

"Thank you, So-Called President Trump! I've been struggling for 2 weeks over what to call you, and your tweet here gave us the answer," Moore tweeted.

Thank you, So-Called President Trump! I've been struggling for 2 weeks over what to call you, and your tweet here gave us the answer. https://t.co/HVf3oSWYum — Michael Moore (@MMFlint) February 5, 2017

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Earlier in the day, Trump defended his travel and refugee restrictions while referring to federal Judge James Robart as a "so-called judge."

"The opinion of this so-called judge, which essentially takes law-enforcement away from our country, is ridiculous and will be overturned!" Trump wrote.

The opinion of this so-called judge, which essentially takes law-enforcement away from our country, is ridiculous and will be overturned! — Donald J. Trump (@realDonaldTrump) February 4, 2017

Robart, who was appointed by former President George W. Bush and approved by a 99-0 Senate vote in 2004, issued a nationwide restraining order Friday against Trump’s action, which had blocked citizens from seven Muslim-majority nations from entering the U.S.