President Donald Trump issued a full-throated endorsement of Florida state Sen. Joe Gruters for the role of Republican National Committee chair."He will be a wonderful Chairman!" the president declared in a post on Truth Social. Current RNC Chairman Michael Whatley announced he is running for U.S. Senate in North Carolina. Trump has endorsed Whatley's campaign.Trump also backed Jennifer Saul-Rich for the role of RNC treasurer.This is a developing story. Check back for updates.