3.21 MOTIONS AND PROPOSITIONS MUST BE GERMANE. (a) A motion or proposition on a subject different from that under consideration must not be admitted under guise of its being an amendment. A motion, amendment, or other proposition offered to the House is out of order if it is not germane to the matter under consideration. Whether a proposition is germane to the matter under consideration is a question to be decided by the presiding officer, who may put the question to the House.
(b) An amendment to an amendment on the House floor must relate only to the primary amendment, without introducing any new subject.