One 2020 presidential hopeful’s chances of securing a spot on the Democratic National Committee’s debate stage have been dashed by what his campaign is calling an “arbitrary” rule change.

Montana Gov. Steve Bullock’s campaign manager Jenn Ridder ripped the DNC on Thursday, six days before contenders have to meet the polling and fundraising criteria to participate in the first debate series, for disqualifying a public opinion survey on which Bullock was relying.