As the first lady departed Andrews Air Force Base, she donned a green khaki jacket, reportedly from Zara, which had "I REALLY DON'T CARE, DO U?" emblazoned on the back in white graffiti lettering.
"She told her staff she wanted to go and we made that happen", Grisham said.
Melania Trump made a surprise trip to the US-Mexican border on Thursday, visiting a migrant children's shelter as her husband's administration seeks to quell a firestorm over family separations.
Melania Trump traveled to a border facility in Texas today where children are being kept.
The controversy was surprising because Melania Trump, a former fashion model, is particularly attuned to visuals, including her sartorial choices.
Justice Department officials have characterized the executive order as a "stopgap" move, saying Congress needs to pass new legislation to give the president more powers to fight illegal immigration.
She asked many questions, seeking assurances that they are being properly cared for.
"I want to thank you for your hard work, your compassion and your kindness", she said. But what matters here is the implication, accidental or not, that First Lady Melania Trump "really [doesn't] care" about what she's doing today - getting a firsthand look at the horrific and inhumane realities for children and families at the border. Some of the young people were children taken from their parents at the USA border with Mexico.
Unsurprisingly, people had strong feelings about the optics of this-including her husband Donald Trump.
Six of them were separated from their parents upon crossing the border, authorities told reporters.
Trump's spokeswoman denied that the jacket had any special significance. The children at the center stay for about 58 days, with half of the children being placed with their parent, 40 percent placed with a relative in the USA and about 10 percent going into foster care or to family friends.
Stephanie Cutter, who was deputy campaign manager for President Barack Obama's reelection campaign, said the first lady could easily have avoided the shift of attention.
Her staff did not announce the Texas trip in advance and required news organisations travelling with her to agree not to publish any information until she arrived.