President Donald Trump’s Justice Department is facing mounting pressure from Republican and conservative advocates to investigate Danco Laboratories, the primary distributor of the abortion drug mifepristone, as scrutiny intensifies over the drug’s safety and regulatory oversight.

Sen. Josh Hawley (R-MO) is leading that effort, penning a letter Tuesday to acting Attorney General Todd Blanche asking him to open a sweeping investigation into the company’s business practices, approval process, and compliance with federal law.