The motion to vacate the chair is a parliamentary rule (peculiar to Congress) that describes the right of any member of the House of Representatives to call for the formal removal of a sitting Speaker of the House and the election of a new one.
This power comes, technically, not from the Constitution but rather from a parliamentary rules manual written by Thomas Jefferson during his tenure as Vice President—and President of the Senate—between 1797 and 1801. The manual—now known as Jefferson's Manual—was adopted by Congress as an official rule book in 1837. The manual does not supersede the Constitution. Instead, it provides the rules—essentially the bylaws—for how Congress conducts its legislative business.
Interesting...I’m not familiar with that but since those Reps. who authored this are of the Freedom Caucus I would suspect they know....but will it be talk or action?
“a motion to vacate the chair” played a key role in the resignation of House Speaker John Boehner so why couldn’t it apply to Pelosi?....Perhaps they don’t actually have to use it just to threaten using it?
Pelosi has said several times they will go down fighting ...I doubt she’d feel threatened.