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DENVER — The Democratic state Senate minority leader stepped down Thursday, citing frustration with majority Republicans’ handling of workplace harassment allegations.

Sen. Lucia Guzman of Denver has struggled this legislative session with Senate Republican leaders over the handling of sexual misconduct allegations against three Republican lawmakers.

Her caucus has demanded floor debate on sanctions against Republican Sen. Randy Baumgardner, who stepped down as chair of the chamber’s transportation committee after an independent investigator found that claims he harassed a former legislative aide were credible.

Baumgardner denies wrongdoing, and Senate President Kevin Grantham has refused to allow debate.

Grantham described some of the anonymous accusations against senators as tantamount to “assault” and he has urged prosecutors to investigate harassment complaints at the Capitol.

Sen. Larry Crowder was accused by Democratic Rep. Susan Lontine of sexual harassment. He denied wrongdoing. And KUNC-FM has reported a third harassment investigation against another senator is continuing.

The Legislature’s workplace harassment policy calls, in most cases, for lawmakers handling complaints to keep them confidential.

Grantham declined to immediately comment on Guzman’s announcement, saying he would issue a statement after business on the Senate floor.

The term-limited Guzman was replaced by Sen. Leroy Garcia of Pueblo. Guzman will serve out her final term as assistant minority leader, and she said she would use that time to fight workplace harassment.

Guzman said the last straw was Republicans’ condemnation of Democratic Sen. Daniel Kagan, who last week was among several Democratic senators demanding floor debate on Baumgardner’s conduct.

Kagan on Friday cited explicit language in Colorado’s criminal code on sexual harassment to argue the level of alleged misconduct being addressed in the Senate didn’t rise to that required for referring complaints to prosecutors.

Republicans this week condemned Kagan’s explicit language. Sen. Beth Martinez Humenik filed a formal harassment complaint against Kagan, alleging she caught him using a women’s restroom last year.

Kagan insisted the restroom was unmarked and that, as a freshman in the Senate, he made an honest mistake. He, Guzman and other Democrats contended the GOP was trying to deflect attention from their demands for debate.

“To see my colleague have to go through that, through something that is based on lies, makes it impossible for me to meet the leadership of the Republican caucus eye-to-eye,” Guzman said.

Democrats introduced a resolution calling for debate on possible expulsion of Baumgardner after Rep. Steve Lebsock, a Democrat, was expelled March 9 in the Democrat-led House over misconduct allegations.