The American detainees were back on U.S. soil late Wednesday, White House national security adviser Jake Sullivan said.
"Refusing to negotiate ... does not guarantee that they’re not going to take other hostages,” said the former U.S. Marine, who was released by Russia in 2022.
Officials had said that the exchange would take place after nearly $6 billion in once-frozen Iranian assets reached Qatar.
Mark Frerichs, a Navy veteran and civilian contractor, was kidnapped in Afghanistan in January 2020.
The trade involves detained Princeton graduate student Xiyue Wang and scientist Massoud Soleimani.
But he still hates it.
Jason Rezaian is coming home.