The base had been cleared of migrants since Thursday, after the government sent 177 to Venezuela and one back to the United States.

The administration flew almost all of the migrants it had held in the facility in Cuba to Honduras, and one to detention in the U.S., NBC News has learned.

Attorneys filed a lawsuit against the Trump administration Saturday to halt the transfer of 10 migrants detained in the U.S. to Guantánamo Bay Naval Base in Cuba. This marks their second legal challenge in under a month against plans to use the facility for large-scale immigrant detention before deportation.

It’s their second legal challenge in less than a month over plans for holding up to 30,000 immigrants there for deportation.