WASHINGTON — The FBI is quietly suspending the security clearances of employees who attended protests before last year’s Capitol riot, The Post has learned. The decision is drawing pushback from Republicans who say the FBI staffers aren’t charged with crimes and are having their First Amendment rights trampled. The FBI’s move was described in a Friday letter from the top Republican on the House Judiciary Committee. “One such targeted employee is [redacted] working in the FBI’s [redacted] who also honorably served in the United States military for over 20 years,” Rep. Jim Jordan (R-Ohio) wrote to FBI Director Christopher Wray.