Attorneys for the House of Representatives and some of its Republican members on Friday argued over whether a shield blocking litigation against lawmakers applied to a lawsuit challenging the chamber’s proxy voting rules adopted during the pandemic.

House Republicans, as well as individuals whose members of Congress used the proxy voting system, filed the complaint in May, alleging the system is unconstitutional and lawmakers must be physically present to have their votes count. Otherwise, their attorneys argue, it dilutes the votes of members who do appear in person.