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.

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.

Randi Weingarten announced plans to exit the Democratic National Committee (DNC). Weingarten, the president of the American Federation of Teachers,