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First lady Melania Trump spent about 90 minutes visiting a Border Patrol station on a Tucson military base Thursday morning, listening to law enforcement officials speak about border security.

It was Trump's second visit to a border state in recent weeks. She flew on to Phoenix, landing there about noon, where she was reportedly set to visit a shelter for detained migrant children.

Melania Trump spent about 90 minutes on the ground in Tucson, remaining within the secure perimeter of Davis-Monthan Air Force Base. Trump spoke with law enforcement officials at the Border Patrol's Tucson Sector headquarters, inside D-M's gates.

Multiple sources told TucsonSentinel.com that Trump was to tour a shelter here that houses about 250 migrant children.

While the White House did not confirm any details of the trip to Arizona, the wife of President Donald Trump landed at the Air Force base here just before 10 a.m. Within minutes after landing, Trump's motorcade of three black SUVs and a pair of Air Force security vehicles drove across the base to a Border Patrol facility on the edge of the base.

After a discussion with officials from U.S. Customs and Border Protection, including BP agents, at which local press were excluded, Melania Trump's blue-liveried aircraft flew to Phoenix, landing at Sky Harbor around noon.

Trump had boarded a plane headed to the Southwest on Thursday morning, but her spokeswoman, Stephanie Grisham, would not tell the press the first lady's destination.

Several sources independently confirmed the planned trip to TucsonSentinel.com on Wednesday, but conditioned their information on remaining anonymous because they were not authorized to reveal details.

Sources had said she was likely to visit the Southwest Key "Estrella" shelter on North Oracle Road, which opened in 2014 and has a capacity of about 300 children. The facility, operated by a nonprofit contractor for the federal Office of Refugee Resettlement, houses unaccompanied minors picked up by the Border Patrol — including some who were separated from their parents under the administration's controversial "zero tolerance" policy.

Melania Trump may also tour a shelter in the Phoenix area, sources said, indicating that she is unlikely to make a visit to the border itself.

Local officials told TucsonSentinel.com on Wednesday that there were plans in the works for the first lady's visit here. Law enforcement officials told the Arizona Republic that state police are preparing to block roads to clear Trump's path across town during her visit.

Last week, Melania Trump visited a shelter in McAllen, Texas — a trip that drew controversy after she wore a jacket with the words "I really don't care, Do U?" emblazoned on the back as she left Washington, D.C. and returned that day.

The Associated Press reported that Trump was wearing a black shirt and white slacks as she boarded her plane near D.C. on Thursday.

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