Brown County Sheriff's Lt Kevin Pawlak said investigators believe the gunman was targeting a specific person he was angry at, but the person wasn't at the Oneida Casino at the time.
"The state of Texas's motion for leave to file a bill of complaint is denied for lack of standing under Article III of the Constitution," the highest court wrote in its three-sentence order on Friday.
Even as Covid-19 infections spike, Trump has stuck to his guns, downplaying the dangers and branding Democrats as rampaging "socialists" intent on shuttering the country.
Nearly 75 million mail-in ballots have been sent or requested so far this year, more than double the 33 million in 2016, according to the US Elections Project of the University of Florida on Monday.