The top Democrat in the U.S. House says Michigan Rep. John Conyers should resign in the face of allegations of sexual misconduct.

Minority Leader Nancy Pelosi told reporters Thursday that the accusations against Conyers are “serious, disappointing and very credible. It’s very sad.”

Conyers is the longest serving member of the House. He has faced increasing calls from House Democrats for him to step down as several former aides have come forward to accuse him of inappropriate sexual behavior.

On Wednesday, Conyers’ Detroit-area attorney Arnold Reed told the AP that Conyers is innocent and has no plans to step down. Conyers was hospitalized in Detroit on Thursday.

Pelosi told reporters “zero tolerance means consequences - for everyone no matter how great the legacy it’s not licensed to harass or discriminate. In fact it makes it even more disappointing.”

A political consultant says U.S. Rep. John Conyers has been hospitalized in Detroit.

Sam Riddle said Thursday he spoke to Conyers’ wife, Monica Conyers. Riddle says he doesn’t know why the Democrat congressman was hospitalized or his condition.

He declined to name the hospital.

The 88-year-old Conyers has been under pressure after multiple women who’ve worked for him accused him of sexual harassment.

He denies the allegations, and his lawyer says he won’t resign. Conyers is the longest-serving member of the U.S. House.

One woman, Marion Brown, told NBC’s “Today” show on Thursday that she was propositioned for sex multiple times over more than a decade before she was fired.

A woman who alleges she was fired because she rejected Congressman John Conyers’ sexual advances has told NBC’s “Today” show that the longest-serving member of the U.S. House subjected her to years of sexual harassment.

Marion Brown said Thursday that the Democrat propositioned her for sex multiple times over more than a decade. She says she stayed on the job because she needed to support her family and found the work rewarding.

The Associated Press left messages Thursday seeking comment from Conyers’ lawyer, who has said the 88-year-old will fight the misconduct allegations.

Last week, BuzzFeed News reported Conyers had settled a complaint in 2015 for $27,000 from a female staffer who alleged she was fired because she rejected his sexual advances.

Brown’s lawyer, Lisa Bloom, confirmed to The Associated Press after the NBC interview aired that Brown was that former employee.

An attorney for U.S. Rep. John Conyers says the 88-year-old lawmaker will fight allegations of sexual misconduct involving former female staff members.

Arnold Reed tells The Associated Press that Conyers is innocent and has no plans to resign. Reed adds that anyone making inappropriate touching or other claims against the Detroit Democrat should be prepared to back them up.

BuzzFeed News reported last week that Conyers settled a complaint in 2015 from a woman who alleged she was fired because she rejected his sexual advances. It says Conyers’ office paid out more than $27,000 in the confidential settlement.

Another former employee, Deanna Maher, said Tuesday that in 1997 Conyers undressed to his underwear in front of her and twice touched her leg inappropriately.

The House Ethics Committee is investigating Conyers.