The Trump-linked America First Policy Institute is the latest group to sue the Biden administration over its effort to impose a workplace COVID-19 vaccine mandate.

AFPI’s Constitutional Litigation Partnership, which worked with former President Donald Trump on his “Big Tech” lawsuit, and the Alliance for Free Citizens on Tuesday asked the 8th Circuit Court of Appeals for an injunction against President Joe Biden’s new Occupational Safety and Health Administration rule. That rule, which would require all businesses with more than 100 employees to mandate vaccines or require weekly testing for workers, was temporarily blocked by the 5th Circuit Court of Appeals on Saturday.