Travis King had been court-martialed at Fort Bliss, Texas, and he took a plea deal to avoid nine additional charges.
Harris agreed to a presidential debate on CNN set for Oct. 23, even though Trump has signaled that he won't debate again.
As a result of the court order, all 19 counties that used the county line had to redesign their primary ballots ahead of the June 4 Democratic primary.
It's the first rally Trump has held in the state since Republican gubernatorial nominee Mark Robinson faced allegations of making offensive comments years ago.