A group of House Republicans asked Defense Secretary Lloyd Austin to take action against “creeping left-wing extremism” in the military.

The letter, led by Montana Rep. Matt Rosendale, was prompted by the department’s review of extremism in its ranks that the House Republicans worry will “root out servicemembers who will not affirm far-left doctrines,” as well as the implementation of a diversity and inclusion officer accompanied by a recruitment video that featured a lesbian wedding and a recruit marching in left-wing protests.