Senator Charles Grassley (R-Iowa) has requested U.S. Attorney General Merrick Garland provide information regarding President Joe Biden’s administration’s decision to shut down a Bureau of Alcohol, Tobacco, Firearms, and Explosives (ATF) operation that had successfully targeted U.S. weapons smuggling networks providing weapons to the Mexican cartels. The request comes after the senator’s office received information about the operation from ATF whistleblowers.