Mark Hamill, the actor best known for playing Luke Skywalker in the Star Wars franchise, found himself on the dark side of the Twitterverse on Sunday.

The day before, presidential adviser and first daughter Ivanka Trump posted a photo to Instagram and Twitter of herself and husband Jared Kushner posing with their 3-year-old son Theodore, who was dressed as a Stormtrooper. “The Force is strong in my family,” she wrote in the caption. Hamill retweeted her post with his own comment: “You misspelled ‘Fraud.’ #GoForceYourself.”

The actor’s tweet about the child’s costume, which has garnered more than 90,000 retweets and 485,000 likes, was met with discord on social media.

Many users heaped praise on Hamill, a vocal critic of President Trump who frequently tweets his disapproval of the administration.

In the fictional Star Wars story, Stormtroopers are the ground force of the Galactic Empire under the leadership of one of the most notable evil characters in pop culture history: Darth Vader. The irony that the young Kushner was dressed up as the “bad guy” of the franchise was also a point of reference.

Others saved their criticism for Hamill, claiming the actor attacked an innocent child dressed up as a favorite character. The Daily Beast’s Tom Sykes said the tweet made Hamill look “stupid and petty,” writing, “It’s hard to make yourself look mean-spirited and intolerant next to the Trumps but, somehow, Hamill managed it.” Scores of Twitter users also blasted Hamill for what they saw as an unwarranted attack on a child.

Hamill responded to the bubbling controversy Monday morning. A Twitter user on Sunday posted a zoomed-in version of the shot of Theodore — sans parents and other distractions — with the caption, “Forget the parents… this kid rocks.” Hamill retweeted the cropped photo with his own stamp of approval: “Agreed,” he wrote.

But Hamill returned his attention to the commander in chief with another Trump-bashing hashtag later in the afternoon. “How are your bone spurs doing these days?” he tweeted at the president. “I’m worried they might prevent you from serving in any ‘Civil War-like fracture.’ #FracturedFootSoldier.”