A number of Big Law firms are stepping into a lawsuit seeking to force the Trump administration to implement the Equal Rights Amendment, with teams of majority-female attorneys filing amicus briefs on behalf of groups and others largely in support of formally entrenching equal rights in the Constitution.

Democratic state attorneys general for Virginia, Illinois and Nevada sued in the U.S. District Court for the District of Columbia earlier this year to try and force the addition of the amendment, after Virginia legislators voted to become the 38th state to ratify it. The lawsuit argues a long-past congressional deadline to ratify the amendment is trumped by the lack of deadlines included in the U.S. Constitution, and five states rescinding their support also doesn’t change the total number of state legislatures that at one point ratified the amendment.