Immigration and border security are top issues in Arizona, the only battleground state that borders Mexico and one that contended with a record influx of asylum seekers last year. Trump has an edge with voters on migration, and Harris has gone on offense to improve her standing on the issue and defuse a key line of political attack for Trump.

Vice President Kamala Harris visited Arizona's border with Mexico, emphasizing her commitment to border security and support for Border Patrol. She discussed tightening asylum restrictions and highlighted her past efforts against crime at the border.

Vice President Kamala Harris is making her first visit to the U.S.-Mexico border since becoming the Democratic presidential nominee.