On March 2, 2018, Lebsock was expelled from the Colorado House of Representatives by a 52-9 vote from that chamber. Lebsock switched from the Democratic Party to the Republican Party on the day he was expelled. House Majority Leader KC Becker (D) introduced a measure to expel Lebsock after Becker reviewed an investigatory report into Lebsock's behavior that found 11 charges of sexual harassment brought against him by women were credible. When Becker announced her intent to file the expulsion resolution, Lebsock said, “I’m not guilty. I’ve done nothing wrong. I have never sexually harassed anyone.” The last time a resolution of expulsion was considered for a Colorado state legislator was 1915. On November 10, 2017, the Denver Post reported on state Rep. Faith Winter's (D) allegations that Lebsock sexually harassed her at a party in 2016. Also on November 10, public radio station KUNC reported on eight other allegations of sexual harassment against Lebsock. After the allegations became public, House Speaker Crisanta Duran (D) removed Lebsock from his position as chairman of the House Local Government Committee and said that he should resign from the state legislature. Lebsock released a statement on November 10 denying the claims and saying Winter and other accusers should file official complaints against him. On November 11, Lebsock told the Denver Post that he was sorry for making the women feel uncomfortable. Winter and two other Lebsock accusers released a joint statement saying that in his apology Lebsock had not taken full responsibility for his actions nor had he addressed complaints of inappropriate touching. On November 13, Winter filed a formal complaint against Lebsock. Duran said she would appoint an independent party to investigate complaints. On January 8, 2018, Lebsock began circulating a document that detailed the sex life of a woman who accused him of sexual harassment and claimed that he was playing an arcade game at the same time that the alleged harassment occurred. On January 17, former legislative staffer Cassie Tanner filed a formal sexual harassment complaint against Lebsock, saying that he had tried to unbutton her shirt at a social event in 2015. Lebsock said he did not attend the event.

See also: Sexual assault and harassment in American politics (2017-2018) Steve Lesbock was mentioned during a wave of sexual assault and misconduct allegations in 2017 and 2018. On November 10, the Denver Post reported on state Rep. Faith Winter's (D) allegations that Lebsock sexually harassed her at a party in 2016. Also on November 10, public radio station KUNC reported on eight other allegations of sexual harassment against Lebsock. After the allegations became public, House Speaker Crisanta Duran (D) removed Lebsock from his position as chairman of the House Local Government Committee and said that he should resign from the state legislature. Lebsock released a statement on November 10 denying the claims and saying Winter and other accusers should file official complaints against him. On November 11, Lebsock told the Denver Post that he was sorry for making the women feel uncomfortable. Winter and two other Lebsock accusers released a joint statement saying that in his apology Lebsock had not taken full responsibility for his actions nor had he addressed complaints of inappropriate touching. On November 13, Winter filed a formal complaint against Lebsock. Duran said she would appoint an independent party to investigate complaints. On January 8, 2018, Lebsock began circulating a document that detailed the sex life of a woman who accused him of sexual harassment and claimed that he was playing an arcade game at the same time that the alleged harassment occurred. On January 17, former legislative staffer Cassie Tanner filed a formal sexual harassment complaint against Lebsock, saying that he had tried to unbutton her shirt at a social event in 2015. Lebsock said he did not attend the event. On February 27, House Majority Leader KC Becker (D) sent a letter to the chamber saying that she had reviewed an investigatory report into Lebsock's behavior that found 11 charges of sexual harassment brought against him by women were credible. She said she would introduce a measure to expel him that would receive a vote on March 2. Lebsock responded to Becker's letter by saying that he would fight the expulsion resolution, which would need 44 of 65 members, a two-thirds majority, in order to pass. “I’m not guilty,” Lebsock said. “I’ve done nothing wrong. I have never sexually harassed anyone.” The last time a resolution of expulsion was considered for a Colorado state legislator was 1915. On March 2, 2018, Lebsock was expelled from the Colorado House of Representatives by a 52-9 vote from that chamber. Lebsock switched from the Democratic Party to the Republican Party on the day he was expelled.