Secretary of State Marco Rubio condemned the German domestic spy agency for designating the Alternative für Deutschland party an “extremist” group.

Germany’s Federal Office for the Protection of the Constitution, the Verfassungsschutz, claimed Friday that the AfD was trying to “undermine the free democratic basic order” — opening up the ability to greater surveil the group. The move drew backlash from the Trump administration, with Rubio and others voicing their concern on social media.