"Brown did not have my confidence to be the party candidate in Barrie", Fedeli told a news conference, declining to discuss the reasons for that move.
On Sunday, Brown appealed to his grassroots supporters in reiterating the People's Guarantee.
But interim leader Vic Fedeli said in an email to the Tory caucus earlier this month that the party has roughly 67,000 fewer members than the 200,000 Brown claimed in early January. He will sit as an independent when the legislature resumes on Tuesday.
To the other candidates running against him, Brown said they must stand united because their common goal is to defeat Kathleen Wynne.
In recent days, Brown mounted a campaign to clear his name, alleging the two women were lying and possibly manipulated by his political enemies. He said his lawyers are in the process of launching a lawsuit against CTV News, which broadcast the allegations.
Brown, meanwhile, characterized the criticism he has faced as "petty internal nonsense" and said it has been a distraction from the issues important to the province.
'Dozens' of Russians hurt in Syria attack, says ministry
I don't know", he said, according to a Pentagon transcript . "It hasn't in this case, thankfully, but it's unsafe ". Russia's foreign minister on Monday warned the United States against "playing with fire" in Syria .
"We have an obligation to the people of Ontario to get our province back on course", he wrote in a message posted on Facebook - his preferred method of communication since stepping down. "We're focused on who we're fighting for", Matthews said, dismissing polls that show the Liberals trailing the Tories.
Hannah Sadovnick, 22, attended Sunday's rally because she's been a staunch supporter of Brown since she heard him speak at an event at Ryerson University a year ago.
"It's time for something completely different", she said, touting her New Democrats as an alternative to the Tories and Liberals, who have been in power for nearly 15 years.
Sadovnick said she doesn't believe the misconduct allegations.
Sources say the leadership process involves filing the appropriate paperwork to register, paying $125,000 in different fees, and then going through the vetting process.
Patrick Brown stepped down from his position late last month amid sexual misconduct allegations, which he has repeatedly and categorically denied. "And just in time, thankfully, for him to enter this leadership race", she said.