The changes would likely dilute Democrats’ support throughout Indianapolis, a politically critical area, and push GOP voters into districts held by Democrats.
The diplomatic spat began when the U.S. president accused Pretoria of unaddressed human rights abuses, which the South African president continues to deny.
The Homeland Security secretary said federal investigators are talking to the suspect’s family and contacts and will release more details when appropriate.
The announcements are part of a wave of immigration-related orders from the administration after two National Guard members were shot near the White House.
The temporary agreement allows refueling at the Caribbean’s country’s air base and airport as Washington continues strikes on smuggling vessels in the region.