The Washington Metropolitan Police Department is investigating “Meet the Press” host David Gregory for a potential violation of the District of Columbia’s gun laws, a spokesman for the department confirmed to The Hill.

While interviewing National Rifle Association (NRA) CEO Wayne LaPierre on Sunday, Gregory held up what appeared to be a 30-round magazine to ask if it should be banned. The cartridge is illegal in Washington, D.C., where “Meet the Press” is filmed.

Gregory’s interview with LaPierre came in the aftermath of the mass shooting at Sandy Hook Elementary School in Newtown, Conn. on Dec. 14. The incident which left 26 dead, including 20 children has sparked new calls for gun control