The potential acquisition of supplement chain GNC by Chinese-owned Harbin Pharmaceuticals has sparked concerns in Congress and among allies of President Trump’s “America First” trade policy, who are calling for a national security review of the deal over claims it could grant Beijing-controlled Harbin access to U.S. military bases and service members’ sensitive information.

Florida Rep. Bill Posey and the Coalition for a Prosperous America, a group that backs domestic companies and supports the Trump administration’s trade efforts, detailed their concerns in letters to Treasury Secretary Steven Mnuchin on Thursday.