INDIANAPOLIS (AP) — Nearly 20 state legislators are protesting Indiana University’s decision to require all students and employees to receive COVID-19 vaccinations, and they want the governor to block the move.

A letter dated Tuesday to Gov. Eric Holcomb calls on him to prohibit any state university from mandating vaccines that don’t have full U.S. Food and Drug Administration approval.

The letter follows IU’s announcement on Friday that COVID-19 vaccinations will be required for the fall semester on all of its campuses.

The letter signed by 19 Republican House members argues that enforcing a mandate for a vaccine that doesn’t have full FDA approval is unconscionable.