Rep. Marjorie Taylor Greene (R-GA) took aim at House speaker Mike Johnson (R-LA) and threatened to strip his power, and a veteran Republican congressional staffer said Georgia Republican lacked a coherent strategy and would only cause more chaos. Greene made a motion to vacate Johnson last Friday, but she lacks much support from other Republicans and there’s no obvious choice to replace him, and GOP political strategist Brendan Buck told MSNBC’s “Way Too Early” that she may have bitten off more than she can chew. “I don’t think she had a plan,” said Buck, who served as a senior communications …