"El Jefe" — or "The Boss" — is one of the oldest jaguars on record along the frontier, popular in Arizona and one of few known such animals to have crossed a border partly lined by a wall and other infrastructure to stop drug traffickers and migrants.

"This is just a way for us to work with our neighbors and promote binational trade,'' the governor said, pointing out that Sonora already is Arizona's largest trading partner.

Donald Trump may be soliciting bids to build a wall along the border, but the governors of Arizona and Sonora are doing what they can to ensure there are doors and windows, at least figuratively speaking, to maintain the flow of goods, services and people.

The governors of Sonora and Arizona said they are not going to let the rhetoric of the presumed Republican presidential contender get in the way of their efforts to expand the cross-border economy.

Despite a renewed U.S. State Department travel warning for Mexico, regions like neighboring Sonora are moving forward with ambitious plans to attract U.S. visitors.

Nogales, Sonora, a traditional tourist attraction that draws streams of visitors from Arizona, is a city of some half a million, but was only about one sixth that size when these Phoenicians posed in front of one of its shops in 1948.

Overwhelmed by a surge in illegal immigration, especially by unaccompanied children, the U.S. government has launched a $1 million international media campaign warning families in Central America that it's best to stay at home.

The mayors of Phoenix and Tucson lead a trade mission to Mexico this week as part of effort to foster relations with Arizona's largest trading partner.

The governor of Sonora, Mexico, defended and even praised his state on its handling of immigration issues during a short press conference Nov. 18 that focused mostly on economic interaction between Arizona and its southern neighbor.

Arizona has more than 90 illegal tunnels under its border with Mexico, the most discovered in any state in the Southwest, law enforcement officials told senators this week.