The managers of the Democrats’ top two 2016 presidential campaigns can’t seem to agree on whether the party is united as the Democratic National Committee gathers this weekend to elect its new chair.

During an interview Friday on MSNBC, Hillary Clinton campaign manager Robby Mook refused to weigh in on the chairman’s race, which is one of the most competitive in recent history. Meanwhile, Sen. Bernie Sanders’ campaign manager, Jeff Weaver, praised Rep. Keith Ellison, a progressive favorite whom Sanders has endorsed, and warned that the other front-runner, former Labor Secretary Tom Perez, is unhealthy for the party.