Under pre-clearance, the Justice Dept approved every change in election procedures to make sure they weren't discriminatory. After Shelby County, with lots of new last minute shenanigans leading to emergency court appeals, SCOTUS has basically taken over preclearance for itself.

Shelby County has, in effect, turned SCOTUS into the micro-manager of American elections, making constant little decisions about every detail of state election administration. Most of it done with emergency petitions, quick votes and no oral arguments.

This, of course, is contrary to the Constitution. Article 1, Section 4, and the 15th Amendment, Section 2, gives authority over elections to Congress. And in the Voting Rights Act, Congress used its 15th Amendment authority to set up Justice Dept pre-clearance.

SCOTUS doesn't have the power to regulate American elections, or to decide election disputes, under the American Constitution. The Constitution explicitly gives all of that authority to Congress in multiple places. Its attempt to do so is an unconstitutional power grab.