Gov. Dave Heineman, a Republican, said federal officials also wouldn’t answer questions about public school attendance by the children and the potential costs to taxpayers.

“Governors and mayors have the right to know when the federal government is transporting a large group of individuals, in this case illegal immigrants, into your state,” Mr. Heineman told The Wall Street Journal in an interview on Saturday. “We need to know who they are, and so far, they are saying they’re not going to give us that information.”

An Obama administration official on Saturday said the Central American children now in Nebraska aren’t at a facility but are being housed with family members and sponsors while they await immigration proceedings. Some of the children arrived in the recent border surge, while others came earlier in the year…

“There are concerns that this type of activity—placing children in locations across the country—is occurring throughout the United States, and information is not being shared appropriately with states,” the Republican Governors Association policy director, Marie Thomas Sanderson, wrote in an email to members on Friday and viewed by the Journal.