The insider also claimed that Melania's staff and aids all advised her not to wear the jacket.
Lena Dunham, Sia, Amber Heard and other stars visited the border city of Tornillo, Texas, on Sunday to protest the Trump administration's policy that separated migrant children from their parents.
First lady Melania Trump at border facility: "How long is the time that the max time that somebody spent here that they are reunited with their family?" "Do U?" emblazoned on the back in bold white typeface; she was not wearing the article of clothing when she landed in McAllen, Texas.
In response to the whole situation, fashion brands have been firing back with their own versions of the jacket, though this time printed with a much more hopeful message.
It didn't work. And the outrage continued to grow, with first lady Melania Trump joining in with a rare policy intervention with an appeal for both sides to work towards a resolution.
She said: "It's a jacket".
The President did decide to reverse his administration's family separation policy, but there are still thousands of children in many different states still separated from their families, and there doesn't appear to be a plan in place to reunite them.
The Department of Homeland Security (DHS) said late on Saturday it had a "well coordinated" process in place - in the face of criticism from lawyers for parents and children who have said they have seen little evidence of an organised system.
'Melania has learned how dishonest they are, and she truly no longer cares!,' said the United States president as he took to his traditional mode of communication - Twitter. "I can't stand this, I think it's insane, I don't care what message she's trying to send to the president or anyone else, it's inappropriate". At this point, 500 children out of more than 2,000 have so far been reunited with their families.
"I'm glad I'm here and I'm looking forward to seeing the children", Melania said at a roundtable discussion with social workers and government officials. She said she started crying when the two were reunited and that she's never going to be away from him again.