A petition that calls for the Trump administration to designate the Ku Klux Klan as a terrorist organization as of Tuesday night had racked up more than 1.6 million signatures, but the designation is impossible, according to two government officials.

Last week, a Washington state man launched the “Change KKK Status into Terrorist Organization” petition, which states that since the inception of the organization at the end of the Civil War, its members have intimidated and murdered people based on ethnicity or religion, specifically black Americans.