Migrant babies and young children are being held in special "tender age" shelters after being taken from their parents at the US-Mexico border.
Drawing cheers at a rally, Trump defended his hard-line immigration policies just hours after backing off efforts to separate immigrant families.
For decades, he was known only as Unknown X-9352 at a World War II American cemetery in Belgium where he was interred.
Trump sees his immigration policy as a winner with voters ahead of midterm elections in spite of controversy over separating children and parents.
The U.S. is leaving the U.N. Human Rights Council, which Ambassador Nikki Haley calls an organization "not worthy of its name."