In a Saturday blogpost, Democratic National Committee chairman Tom Perez vowed to enact reforms to the party’s presidential nominating process aimed at ensuring that “the new DNC will work to rebuild trust with the people we represent.”

Perez’s column on Medium, entitled “Making 2020 Transparent,” was a response to revelations by former interim DNC chairwoman Donna Brazile last week that in a signed agreement the committee had effectively surrendered its independence to Hillary Clinton’s campaign in August 2015 ― months before 2016 presidential primary voters went to the polls. Many supporters of Sen. Bernie Sanders (I-Vt.) interpreted the news as confirmation that the party had treated him unfairly.

“I am more committed than ever before to restoring voters’ faith in our democratic process because even the perception of impartiality or an unfair advantage undermines our ability to win,” Perez said. “That is unacceptable.”

“After listening to Democrats from every wing of our party, I’ve developed a series of concrete reforms to put our principles into action and guarantee that under my watch, the new DNC will work to rebuild trust with the people we represent,” he said.

The “principles” Perez plans to employ include deciding the presidential primary debate schedule well before voting in the contests begins and making transparent to the public any joint fundraising agreements the DNC makes.

He also promised to support the work of the Unity Reform Commission, a panel formed in July 2016 as a compromise with delegates who backed Sanders at the Democratic National Convention.

“We will work with the Unity Reform Commission to implement their collective recommendations for meaningful change in our party,” Perez said.