Rep. Marjorie Taylor Greene (R-GA) isn’t happy with reports that former President Donald Trump’s campaign is seeking to hire Laura Loomer, an activist with a history of bigoted and anti-Muslim remarks.

Greene blasted Loomer as “mentally unstable” and a “liar.”

Trump recently met with Loomer and told his campaign advisers to give her a role to help boost his candidacy, either in the campaign itself or the main super PAC backing his White House bid, sources told the New York Times. The reported move was met with widespread criticism, including inside the GOP.

“Laura Loomer is mentally unstable and a documented liar. She can not be trusted,” Greene tweeted. “Never hire or do business with a liar. Liars are toxic and poisonous to everything they touch. I’ll make sure [Trump] knows.”