In late October, allies of Rep. Mike Johnson (R-Louisiana) breathed a sign of relief when House Republicans unanimously confirmed him as House speaker — a confirmation that followed weeks of chaos and turmoil after former Rep. Kevin McCarthy (R-California) was ousted from that position thanks to a “motion to vacate” triggered by Rep. Matt Gaetz (R-Florida). But after six months as speaker, Johnson may face the same fate that McCarthy suffered. Far-right Rep. Marjorie Taylor Greene (R-Georgia) is threatening to use the “motion to vacate” tool against Johnson. And if she succeeds in forcing a vo…