The arrest followed Mexican President Sheinbaum’s refusal of U.S. President Trump’s offered to send troops into Mexico to help combat the drug cartels.
Miller was a senior adviser in Trump’s first term and has been a central figure in policy decisions, focusing on illegal immigration and border security.
Federal officials on the southern border say the president’s designation of cartels as terrorist organizations put more teeth in gun trafficking enforcement.
The U.S. Treasury froze assets of a major Mexican cartel fuel-theft ring, sanctioning three brothers and two trucking firms tied to fentanyl trafficking.