Former Colorado GOP Chairman Steve Curtis was found guilty of forgery and voter fraud on Thursday for signing his ex-wife's mail-in ballot for the 2016 general election, Denver's ABC affiliate reports.

Curtis filled out and signed the ballot under his ex-wife's name. The forgery charge for signing the ballot carries a maximum three-year prison sentence, while the separate misdemeanor charge could carry an 18-month sentence and a possible $5,000 fine.

The Republican was charged on Feb. 1 after his former spouse moved to South Carolina and reportedly asked a county clerk how she could vote via mail-in ballot.

An attorney representing Curtis tried to argue the former chairman was in a confused diabetic state at the time of the incident, but Deputy District Attorney Tate Costin said Curtis "knew exactly what he was doing" in the closing arguments of the four-day trial.

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The former chairman's guilty plea comes after he reportedly told local news station KLZ 560 that "virtually every case of voter fraud I can remember in my lifetime was committed by Democrats."

Curtis served as the Colorado GOP's chairman from 1997 to 1999. The sentencing hearing is scheduled for Jan. 26.

President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE argued during his 2016 campaign that the election was "rigged" against him and that there was a possibility of widespread voter fraud.