Five of the people flown to Liberia under the Trump administration's third-country deportation program resisted leaving the plane. They were then flown to Equatorial Guinea.
The GEO Group has profited from the administration's mass deportation campaign. A subsidiary donated more than $1.4 million to the president's super PAC last month.
Officials familiar with the defense secretary's thinking believe he is considering a run for president or some other office after his time in the Trump administration ends.