For hundreds of U.S. citizens who frequently cross the border, shutting down ports of entry could leave them stranded in Mexico.

It's not yet clear if troops stationed at the U.S.-Mexico border will be able to return home by Christmas.

US officials begin training Mexican police to improve border security.

Security measures such as police exercises and fences have been taken ahead of the possible arrival of a migrant caravan.

Trump's threats against the migrant caravan isn't stopping it from reaching the border, according to a group helping with coordination.

For now, people caught entering the U.S. illegally are given an ankle bracelet and a bus ticket to go stay with family while awaiting their immigration hearing. The process is known as "catch and release."