In response to violence at a white supremacists rally in Charlottesville, Va. Saturday — in which a self-proclaimed member of the racist group drove his car into a crowd of counter-protesters, killing one — the Illinois state Senate adopted a resolution Sunday that takes a hard stance on white supremacy and neo-Nazi groups.

The resolution urges law enforcement officials to label white nationalist groups and neo-Nazis as terrorist organizations, according to the Chicago Tribune.

State Sen. Don Harmon (D), who sponsored the resolution, said it was “vital” to stand up and condemn the “hatred, bigotry and violence” that white nationalists displayed over the weekend.

“They are the heirs of the Ku Klux Klan and the Nazis. We fought two bloody wars in opposition to their ideologies. We must continue to fight those same twisted ideologies today,” he tweeted Sunday. “Diversity has always and will always make America stronger and better.”

1/ I introduced a resolution in the Senate today condemning the inexcusable violence committed by white nationalist & neo-Nazi groups — Don Harmon (@DonHarmonIL) August 13, 2017

2/ in Charlottesville yesterday. It is vital that we stand in total opposition to the hatred, bigotry & violence displayed by these groups. — Don Harmon (@DonHarmonIL) August 13, 2017

3/ They are the heirs to the Ku Klux Klan and the Nazis. We fought two bloody wars in opposition to their ideologies. — Don Harmon (@DonHarmonIL) August 13, 2017

4/ We must continue to fight those same twisted ideologies today. — Don Harmon (@DonHarmonIL) August 13, 2017

5/ Diversity has always and will always make America stronger and better. — Don Harmon (@DonHarmonIL) August 13, 2017

6/ . We condemn these groups and their actions, as they are the opposite of what our country strives to be. — Don Harmon (@DonHarmonIL) August 13, 2017