Her second scheduled stop was to the Ursula Border Patrol Processing Center, a Customs and Border Patrol intake center.
First lady Melania Trump made a surprise trip to Texas on Thursday to visit border facilities amid the administration's crisis over the separation of families.
"She believes we need to be a country that follows all laws, but also a country that governs with heart".
Although family separation is over, Sixth Presbyterian Reverend Vince Kolb said the fight is just beginning.
Trump's order suggests the government intends to hold the families indefinitely by challenging a 1997 court ruling known as the Flores Settlement, which places a 20-day limit on how long children, alone or with their parents, can be detained.
"I'm here to learn about your facility, in which I know you house children on a long-term basis", Melania Trump said at the Upbring New Hope Children's Shelter.
After remaining silent as calls mounted for her to weigh in on President Donald Trump's policy of separating migrant families at the border, Ivanka Trump finally congratulated the president for ending his own policy - and called for the government to "swiftly and safely" reunify the families who have been separated.
"It's about keeping families together while at the same time making sure that we have a very powerful, very strong border", Mr. Trump said as he signed the order in a hastily arranged Oval Office gathering.
Mrs Trump, sitting with officials at a centre in McAllen, Texas, said: "How can I help these families reunite with their children as quickly as possible?"
Mrs. Trump left Washington wearing a green, hooded military jacket that had "I really don't care, do u?" written in graffiti-style on the back in white lettering that left the blogosphere wondering what message she was trying to send as she flew off to visit migrant children.
Trump's comments come as the House of Representatives prepares to vote on two immigration proposals offering amnesty to children of illegal immigrants in exchange for border security funding and visa lottery reforms.
"She wants to see what's happening for herself and she wants to lend her support, executive order or not", said Grisham.
The Trump administration previously had not said whether any hundreds of children who were separated from their families had been reunited. He did not mention that an executive order wasn't needed to end the practice, as the Department of Justice had begun such a policy in April without one.
The Trump administration's so-called "zero tolerance" policy has resulted in many people being taken into federal custody immediately after crossing the border.
Trump signed an executive order requiring immigrant families be detained together when they are caught entering the country illegally for as long as their criminal proceedings take.
"Transitioning from the cruel and inhumane policy of family separation to the cruel and inhumane policy of indefinite family detention can not be the solution here", read the statement by HIAS President Mark Hetfield.