The Trump administration is revoking the visas of pro-Hamas foreign students in the United States “every day” as it wages a heavy-handed crackdown on terrorist sympathizers, according to the State Department.

Secretary of State Marco Rubio boasted Thursday that at least 300 student visas have been revoked since President Donald Trump took office and that they’re “looking every day” for more. “It might be more than 300 at this point.

A Tufts University doctoral student arrested by immigration enforcement agents Tuesday was sent to a detention center in Louisiana before a judge ordered the government to keep her in Massachusetts, federal prosecutors said in a court filing Thursday morning.