Much of Ken Martin’s four months as head of the Democratic National Committee have been engulfed in a feud with David Hogg, the Gen Z activist who vowed to back primary challengers to Democratic incumbents in conflict with other party leaders.

Hogg, who has levied harsh criticism over elderly Democrats' refusals to step down from their posts, will continue supporting primaries against senior members.

David Hogg, who was at the center of controversy over his efforts to primary incumbents in Congress, is leaving the Democratic National Committee.