President Donald Trump’s son Donald Trump Jr. went after Sen. Mitt Romney (R-Utah) after he voted to remove his father from office.

Don Jr. took jabs at the Romney on Instagram, sharing a photo of the GOP senator and former presidential nominee rocking a white button-down and faded blue-jeans with the caption, “Mom Jeans – Because you’re a pussy.”

Romney voted yes to convict Trump on one of the articles of impeachment brought against him. He voted no for the other article – obstruction of Congress.

“Mitt Romney is forever bitter that he will never be POTUS. He was too weak to beat the Democrats then so he’s joining them now,” Trump Jr. wrote. “He’s now officially a member of the resistance & should be expelled from the GOP.”