Six Republican and unaffiliated voters in Colorado had filed the lawsuit that led to the state Supreme Court ruling.
Grimsley predicted that claim will be closely scrutinized by the Supreme Court justices during oral arguments.
"I think the justices will be very interested in that question, if only because President or former President Trump has made that the lead argument in this case," Grimsley said.
Three of the nine Supreme Court justices who will hear his appeal Thursday were appointed by Trump — Neil Gorsuch, Brett Kavanaugh, and Amy Coney Barrett.
Three other justices who were appointed by Republican presidents with Trump's appointees comprise a conservative supermajority on the Supreme Court.
Persons:
Donald Trump, Jared Polis, Doug Burgum, Trump, Joe Biden, Nikki Haley, Colorado's, Sean Grimsley, Grimsley, Mario Nicolais, Nicolais, Trump — Neil Gorsuch, Brett Kavanaugh, Amy Coney Barrett
Organizations:
Colorado, North Dakota, White, U.S, Supreme, Republican, Constitution, United, The, The Colorado Supreme Court, GOP, South Carolina Gov
Locations:
Washington ,, Colorado, United States, The Colorado