House Speaker Mike Johnson (R-Louisiana)’s already tenuous Republican majority is down one more member after a surprise retirement announcement by Rep. Bill Johnson (R-Ohio). MSNBC producer Kyle Griffin tweeted Tuesday that Johnson would be resigning from Congress effective January 21, leaving Republicans with just 219 members to Democrats’ 213, with three seats still vacant. Assuming full attendance, Johnson can now only afford two defections from his caucus in order to pass legislation. According to The Hill, Johnson’s sudden resignation came after the congressman accepted a job offer to bec…