Conyers has continued to deny the women's accounts, and his lawyer said Conyers would not pay back the settlement money that was paid to Brown at taxpayer expense.
Meanwhile, Conyers, 88, announced in a Detroit radio interview Tuesday that he was retiring effective immediately after serving more than half a century in the House.
"I was taught by a great woman, my mother, to honor women", Conyers wrote, according to the congresswoman.
Conyers" attorney Arnold Reed told the Detroit Free Press the new allegations from Grubbs are "another instance of tomfoolery from the mouth of Harvey Weinstein's attorney'.
The veteran lawmaker said that he is also endorsing his son, John Conyers III, to fill his seat.
A rally with leaders, ministers and activists is planned Monday in Detroit to call for due process for Rep. John Conyers after sexual harassment allegations against him emerged.
It's more than an unfortunate ending to an illustrious career, it's a sad day in MI and US history. "We're calling for due process for every citizen, which also includes Congressman John Conyers by the same body which is supposed to uphold and defend due process".
Gaddis also asked Conyers whether he believes the allegations that have been made against him will impact his legacy.
I pray for congressman Conyers and his family and wish them well however Congressman Conyers should resign' said Pelosi
On Monday, a crowd of 200 in Detroit showed support for the congressman, who was hospitalized last week for stress related health issues. "And I want everyone to know how much I appreciate the support that...incredible, undiminished support I've received across the years of my supporters, not only in my district but across the country as well", Conyers said.
Melanie Sloan, a former Conyers aide and Washington lawyer, told The Washington Post last week that Conyers harassed and verbally abused her when she worked for his Washington office in the 1990s.
Conyers is one of four sitting USA lawmakers hit by allegations of sexual misconduct in the wake of the claims targeting movie mogul Harvey Weinstein, which triggered a torrent of accusations against powerful figures in the worlds of entertainment, media and politics.
But after being publicly accused by one woman after another in recent weeks, he faced growing calls to resign from colleagues in the House, including Democratic Leader Nancy Pelosi.
Days later, the congressman stepped down as the top Democrat on the House Judiciary Committee during a congressional ethics probe of the sexual harassment allegations.
Ian Conyers did not go into detail with the Times on the allegations against his family member, but said he would stand with him.
Republican congressman Joe Barton separately announced last week he would not seek re-election after a nude photograph of him taken while he was separated from his wife circulated online. Conyers was called the unofficial "dean of the House" and was its longest-serving member until his announcement.