Rep. Katie Porter, D-Calif., wore a Halloween costume and kept her mask on during a vote Thursday in the House Financial Services Committee.

At one point, Porter reportedly yelled at a reporter about her outfit.

“It’s Batgirl!” she told Washington Post reporter Mike DeBonis.

She wore her outfit on the same day Democrats voted for a resolution on ground rules for the impeachment inquiry surrounding President Trump. For Republicans, Porter's display was inappropriate.

"As House Democrats prepare to officially blow up their Majority with impeachment, @RepKatiePorter is prancing around dressed as Batman. This is how seriously these clowns are taking impeachment," the National Republican Congressional Committee tweeted on Thursday.

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Steve Guest, the spokesman for the Republican National Committee, also took to Twitter to assail the lawmaker's decision to wear her costume on Thursday.

"Democrat Rep. Katie Porter is making a mockery of the House of Representatives," Guest tweeted. Alongside his tweet was a photo of Porter sitting in the Financial Services Committee.

Porter responded via tweet: "Taking my work in Congress seriously doesn’t mean I take *myself* too seriously. To my kids Luke, Paul, and Betsy, I’m still just Mom—seeing the Bat Signal on Halloween & putting on a goofy costume come with the territory."

Others defended Porter on Twitter. The Young Turks contributor Hasan Piker said that Porter was "f-----g dope" and told critics to "shut the f--k up."

"Of course Republicans, who love their criminal president, got triggered by a Democrat dressing up as someone who beats criminals to a pulp," filmmaker Adam Best tweeted.