Mexican President Claudia Sheinbaum is pulling out all the stops to support the roughly 5 million undocumented Mexicans living in the U.S.

With President Trump back in office, Mexico's President Sheinbaum braces for strained relations. U.S. public support for hardline policies targeting Mexico is on the rise, and looming energy reforms and trade negotiations add to the challenges.

All along the 2,000-mile border, business leaders, border agents, migrants and their advocates are bracing for change in U.S. policies on trade and immigration.