New York Governor Andrew Cuomo is facing mounting pressure over sexual misconduct allegations, after the state Assembly speaker authorized an impeachment investigation on Thursday.

The investigation would run parallel to one being led by state Attorney General Letitia James, and comes as a growing number of politicians call for Cuomo to step down.

Longtime political rival New York City Mayor Bill DeBlasio on Thursday called Cuomo’s alleged behavior “unacceptable” and “disgusting,” while Senate Majority Leader Chuck Schumer said earlier this week the accusations were “deeply troubling.”

More than 55 Democratic state lawmakers also issued a letter Thursday calling for Cuomo’s resignation. Six women have come forward with harassment allegations against Cuomo, most of whom are former aides.

The most recent accusation comes from an unnamed aide who told local media on Tuesday that Cuomo had groped her after calling her to the executive mansion last year under the pretext of business.

Cuomo issued a broad apology last week for any past behavior that may have made women feel uncomfortable. But he has denied all the allegations and insisted he will not resign, asking the public to await the results of the probe first.