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.

The Democratic Party faces new turmoil as top labor union presidents exit DNC, citing concerns about party leadership direction in a resignation letter to Chair Ken Martin.

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.