Trump has declared an emergency on the border despite migration levels and fentanyl overdoses significantly dipping over the part year.

The last-minute deal had echoes of Trump's first administration, when he threatened Mexico with tariffs and Sheinbaum's predecessor Andrés Manuel López Obrador defused the threat, sending thousands of troops under his newly created National Guard to deter migrants from crossing the border.

Mexico has begun deploying 10,000 soldiers and gendarmes at the border with the USA to curb fentanyl smuggling and illegal migration, following an agreement with the USA. The operation to deploy 10,000 soldiers and gendarmes at the border with the USA started in earnest.