(CNN)Former President Donald Trump and attorney Rudy Giuliani are being accused of conspiring with the far-right groups Proud Boys and Oath Keepers to incite the January 6 insurrection in a civil lawsuit filed Tuesday in federal court by the Democratic chairman of the House Homeland Security Committee. The suit cites a post-Civil War law designed to combat violence and intimidation by the Ku Klux Klan.

The lawsuit, filed by Mississippi Democratic Rep. Bennie Thompson in his personal capacity, is the first civil action filed against the former President related to the attack at the US Capitol and comes days after the Senate acquitted Trump in his impeachment trial.