Montana’s Republican legislative leadership on Monday requested that the U.S. Supreme Court take up the months-long case on lawmakers’ subpoena powers and the legal actions of sitting Montana Supreme Court justices, advancing a fraught political drama that has embroiled much of state government since spring. The filing, submitted by Montana Attorney General Austin Knudsen, asks the nation’s highest court to consider the case under the premise that the Legislature’s right to due process, as outlined in the Fourteenth Amendment, has been infringed by recent Montana Supreme Court decisions.