She also thanked the medical staff and social workers for their "hard work", "compassion" and "kindness". The facility is home to about 55 migrant teenagers.
First lady Melania Trump made a surprise trip to the southern border on Thursday amid the firestorm over the Trump administration's separation of migrant families.
"You could be creating thousands of immigrant orphans in the USA that one day could become eligible for citizenship when they are adopted", Sandweg told NBC News this week.
House Republicans have made a decision to postpone a vote on one of two immigration bills until Friday.
The Republican-controlled House earlier on Thursday defeated another, more conservative immigration bill created to significantly reduce visas for legal immigration to the United States and to temporarily protect from deportation young "Dreamers" brought to the country illegally as children. It was pushed back again after lawmakers said they failed to resolve differences on key issues in a Thursday evening meeting. "There was no hidden message".
Grisham underscored that message in a tweet with the hashtags #SheCares and #ItsJustAJacket.
Grisham added that the trip was "100 percent her idea".
The goal of the visit to McAllen, Texas, was "to take part in briefings and tours at a nonprofit social services center for children who have entered the United States illegally and a customs and border patrol processing center", according to a statement released by the White House.
Number of refugees - 68 million - hits five-year high, United Nations says
The agency calculates that one in every 110 people in the world is a refugee, either internally displaced or seeking asylum. He cited the recent Italian decision to deny entry to a rescue vessel with 629 refugees and migrants on board.
The political compromise the first lady had sought so far has not materialized. In public appearances, the first lady has worn designs by Dolce & Gabbana, Del Pozo, Christian Dior, Emilio Pucci, Givenchy and Valentino, often with daringly high Christian Louboutin heels. "We do not want children taken away from their parents".
The New Hope Children's Facility is run by Upbring, a non-profit organization that facilitates foster care and adoptions, and runs shelters for children. She called on Congress to work together on immigration legislation that would benefit the children.
"I'm looking forward to seeing the children and ask you how I can help these children to reunite with their families as quickly as possible", said Mrs. Trump.
The first lady is doing things her way. She spoke to many individually through a translator, and as she walked out she told them: "Be kind and nice to each other, OK?"
CBP officials will monitor migration patterns at the border to see if the policy change leads to an increase in illegal crossings by family groups, the official said.
Lawyers filed a memorandum to a settlement in California that governs how children are handled when they are caught crossing the United States border illegally.
There was however no immediate plan in place to reunite the more than 2,300 children already separated from their families - igniting a fresh controversy over the conditions in which the children are living.