SACRAMENTO, Calif. (AP) — Pressure is growing on Democratic Sen. Tony Mendoza to resign following multiple allegations of sexual misconduct toward young women who worked for him.

Republican Sen. Andy Vidak said Thursday that he'll introduce a resolution to expel Mendoza when lawmakers return in January if he hasn't stepped aside. The comments come after Democratic Sen. Connie Leyva told the news website CALmatters that Mendoza should leave office.

Mendoza is accused of inappropriate behavior including inviting a young woman who worked for him to his home earlier this year and offering another alcohol several years ago when she was underage. He denies wrongdoing. In the Assembly, meanwhile, two Democratic members have resigned over alleged misconduct.

The growing calls for Mendoza's resignation come as Senate President Pro Tem Kevin de Leon, a Democrat, plans to address reporters Thursday about the Senate's efforts to end harassment. De Leon was Mendoza's roommate in Sacramento until recently. He's announced Senate plans to hire an outside investigator to look into the allegations against Mendoza, but few details are available on the investigation's progress.

De Leon is also in the middle of a U.S. Senate bid against incumbent Sen. Dianne Feinstein, a fellow Democrat and one of the most prominent women in California politics.

His scheduled meeting with reporters is his first official press conference on harassment at the Capitol since nearly 150 women signed a mid-October letter saying it is widespread.