In her resignation letter, Randi Weingarten referenced her disagreements with Democratic National Committee Chairman Ken Martin's leadership as a reason she couldn't continue as one of the organization's leaders.

Two union leaders and longtime Democratic National Committee members have resigned from the national party, marking the latest internal dispute of chairman Ken Martin’s tenure. The departures of American Federation of Teachers leader Randi Weingarten and Lee Saunders,

I appear to be out of step with the leadership you are forging,” she wrote in a letter to DNC Chair Ken Martin.