Four divided families were able to reunite for two minutes each at the border on Sunday in commemoration of Mexico's Children's Day.
The 5th Circuit Court of Appeals heard arguments over whether President Obama can shield millions from deportation.
Texas Rep. John Culberson, a Republican, says the federal government is required to hold 34,000 immigrant detainees a day, but the Obama administration disagrees with that interpretation of the law.
About a month ago, Tijuana officials placed hundreds of homeless people in rehabilitation centers, causing concerns about the quality and humaneness of the treatment they'll receive.
Federal authorities are holding fewer immigrants in detention, a reversal in a decade-long upward trend of locking people up who are in the deportation process. The detainees are facing deportation for various reasons, including committing a crime or being in the U.S. illegally.