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 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.

American Federation of Teachers President Randi Weingarten, a longtime powerhouse member of the Democratic National Committee, is leaving the DNC, according to a letter obtained by POLITICO. Weingarten,