WASHINGTON (Reuters) -President Donald Trump's use of the Guantanamo Bay naval base to house migrants appears to cost $100,000 per day for each detainee, U.S. Senator Gary Peters said during a hearing on Tuesday, decrying what he described as a prime example of wasteful government spending. 

Peters, the top Democrat on the Senate Homeland Security and Governmental Affairs Committee, questioned Homeland Security Secretary Kristi Noem about the high cost, far more than the $165 per day in U.S. immigration detention facilities. Peters also asked why detainees have been sent to the American naval base in Cuba but then shuttled back to the United States at taxpayer expense. 

"We're spending $100,000 a day to keep someone at Guantanamo," Peters said. "We keep them there awhile, then we fly them back to the United States, or we could keep them here for $165 a day. I think that's kind of outrageous."

The White House has requested a huge increase in funding for immigration enforcement as it tries to achieve Trump's goal of mass deportations. The administration asked Congress this month for an additional $44 billion for the Department of Homeland Security in fiscal year 2026, which begins on Oct. 1.

Noem, appearing before the committee to defend the budget request, said she did not know the daily cost to house migrants at Guantanamo Bay. Her department did not immediately respond to a request for comment.

A U.S. official, speaking on condition of anonymity, said there were roughly 70 migrants currently detained there.

The American Civil Liberties Union filed a lawsuit in March to prevent 10 migrants from being transferred to the base. In the suit, ACLU alleged that migrants at Guantanamo had been held in windowless rooms for at least 23 hours per day, subjected to invasive strip searches, and unable to contact family members. Some had attempted suicide, the ACLU said.

Senator Rand Paul, the Republican chairman of the committee, also raised concerns with spending for additional barriers at the U.S.-Mexico border since the number of migrants caught crossing illegally has plummeted since Trump took office. A sweeping U.S. House of Representatives budget plan would devote $46.5 billion to the border wall alone.

"I'm not saying no new money is needed," Paul said. "I think you need more Border Patrol, and you're going to need more money for that, but I think it should be within reason."