All migrant children under age 5 who were separated at the US-Mexico border will have been reunited with their parents by early Thursday morning if they were eligible, a Trump administration official said in a statement on Wednesday.

The American Civil Liberties Union, which sued the government over its separation policies, disputed the assertion.

“Their statement is vague at a minimum," said attorney Lee Gelernt, noting that a San Diego judge had set a deadline of Tuesday for reuniting those children. "We know they missed the deadline.”

The government has said some children were not eligible for reunification because the parent was deported, had a criminal record or was otherwise unfit.

US Judge Dana Sabraw in San Diego had ordered the government to reunite the children under the age of 5 by Tuesday and all separated children by July 26.