As we posted earlier  today, the justices of the Supreme Court were considering an emergency stay of lower court rulings finding Ohio voting law changes unconstitutional.
That request apparently went to the full court and, as Lyle Denniston at SCOTUSblog notes here , was granted:
With just sixteen hours before polling stations were to open in Ohio, the Supreme Court on Monday afternoon blocked voters  from beginning tomorrow to cast their ballots in this year’s general election. By a vote of five to four, the Justices put on hold a federal judge’s order providing new opportunities for voting before election day, beyond what state leaders wanted.
The order will remain in effect until the Court acts on an appeal by state officials. If that is denied, then the order lapses. It is unclear when that scenario will unfold. The state’s petition has not yet been filed formally.