An administration official said on Sunday 522 children were able to be reunited because their parents came back from court proceedings quickly enough that the children had not yet been transferred to the custody of the Department of Health and Human Services, where the more than 2,000 children who remain separated from their parents are now.
Mr Trump, elected on a platform of clamping down on undocumented immigrants, also labelled the U.S. system "a mockery to good immigration policy and law and order".
The reunions come after weeks of public backlash over the Trump administration's practice of separating families, many of whom had crossed the border illegally and sought asylum in the US.
"The United States government knows the location of all children in its custody", the statement read, but it did not claim that the government knows who or where all the children's parents are. In essence, the families will either be reunited before they are deported back to the unsafe communities they fled from. Referring to Democrats, he said: "Their issue is open borders".
President Donald Trump on Sunday compared people entering the USA from Mexico to invaders and said they should be immediately sent back without appearing before a judge.
Trump tweeted Saturday morning that President Obama kept immigrants "in cages, wrapped in foil", pushing a Drudge Report headline that linked to an article that ran in The Daily Caller, a conservative media outlet.
"It's very hard to reunite children with their parents because these government agencies were not prepared, and they're not designed, for family separation", said Efren Olivares, a lawyer with the Texas Civil Rights Project that represents 381 migrant parents.
A 1997 landmark case known as the Flores settlement governs how children are handled in immigration custody and generally prevents the government from keeping them in detention, even with their parents, for more than 20 days.
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"The president is doubling down on his immigration ideology, which is perhaps best summed up by the president's recent comments that we're dealing with an "infestation" of criminals", he said.
"It's not something that appreciates these young children and was certainly done in a "ready, fire, aim" way, obviously", said Republican Sen. An investigation by The Texas Tribune found that inspectors in recent years identified hundreds of violations at nonprofit Southwest Key's 16 Texas facilities, including 13 at Casa Padre. She said she started crying when the two were reunited and that she's never going to be away from him again. She says, "That's not the America that we know". Border patrol agents did not say where it was headed.
She says Immigration and Customs Enforcement has asked her for a list of names to assist in the process.
The fact sheet did not state how long it might take to reunite families.
The Trump administration enacted a "zero tolerance" policy against undocumented immigrants entering the country in April.
Protest marches were scheduled over the weekend in several cities, and advocacy groups including the Human Rights Campaign and the American Civil Liberties Union are calling for a nationwide "Families Belong Together" protest on Saturday this week.
Trump also continued to blame Democrats in the Republican-controlled Congress, saying House Republicans could "easily pass" a strong border security bill, but it would still have to pass the Senate "and for that we need 10 Democrat votes, and all they do is RESIST".