I think, it will be about not curating the App Store offering based on policies not compatible with the First Amendment (to the United States of America constitution, for all you foreigners). However, Jim Jordan, specifically, has been known to be not nearly as critical of Big Tech censorship as you would expect him, as a Republican.
Of course, forcing Apple to allow the installation of any app even from outside of the App Store would allow the likes of Parler, Gab or Alex Jones apps back on peoples’ devices. Apple wouldn’t be able to do anything about it. If faced with either having to allow outside apps or letting Alex Jones back on the App Store, I don’t know, where Apple would come down. I have a feeling that, unlike with Twitter, the obvious business interests would prevail, and Apple would choose the latter option.