Secretary of State John F. Kerry, in his first remarks on the controversial prisoner swap involving American soldier Bowe Bergdahl, said if the five released Taliban leaders reenter the fight, they would risk being killed by the U.S.

He spoke as reports emerged that Bergdahl, held for five years and released May 31, had been locked in a metal cage for long periods as punishment for trying to escape his captors.

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FOR THE RECORD

June 9, 1:54 p.m.: An earlier version of this post incorrectly identified Mike D. Rogers (R-Ala.) as the chair of the House Intelligence Committee.  Mike Rogers (R-Mich.) is the chair of the House Intelligence Committee. All remarks attributed to Rogers in this post were made by the Michigan congressman.

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His release in exchange for five Guantanamo Bay detainees dominated the Sunday talk shows amid reports the FBI is investigating death threats against Bergdahl’s family.

Kerry, talking about the prospect of the former Guantanamo Bay detainees returning to the battlefield, said: “I’m not telling you that they don’t have some ability at some point to go back and get involved, but they also have an ability to get killed doing that.”

He said Qatar, where the Taliban leaders will live for one year, would be monitoring the men and that the U.S. would also keep an eye on them. “Nobody, no one should doubt the capacity of America to protect Americans,” he added.

Kerry, the top U.S. diplomat and a Vietnam veteran, was interviewed on CNN’s “State of the Union.”

Sen. John McCain, who was held captive in Vietnam for more than five years, took issue with Kerry in a separate interview on the same program by saying that 30% of the detainees released from Guantanamo Bay had reentered the fight and “we certainly haven’t been able to kill of all them.”

“So what we’re doing here is … reconstituting the Taliban government, the same guys that are mass murderers,” said McCain, an Arizona Republican who was the 2008 GOP presidential nominee.

McCain said he had in the past signed off on the outlines of a prisoner swap to retrieve Bergdahl, but not specifically the “top five picked by the Taliban.”

He said those held at Guantanamo Bay were the “hardest of the hard-core” who “became a lot harder after their years in Guantanamo.” Others have raised questions about how potentially dangerous the men were.

When asked whether reports that Bergdahl deserted his Army unit made him less worthy of rescue, McCain said no.

But he added that the obligation to bring back captured military personnel had to be weighed against whether the effort “would put the lives of other American men and women who are serving in danger.”

“And in my view, this clearly would,” he said.

Republican Rep. Mike Rogers of Michigan, who chairs the House Intelligence Committee, decried the prisoner swap that freed Bergdahl, saying he was “absolutely convinced” some or all of the freed Taliban leaders would join the fight against Americans left in Afghanistan. The released Taliban leaders now are subject to a year-long travel ban intended to prevent them from leaving Qatar.

“Not all five, but I do believe three for sure, likely four … will probably play some role in active operations,” said Rogers, describing the fifth Taliban leader as being “on the fence.”

Rogers, appearing on ABC’s “This Week With George Stephanopoulos,” warned of other dire consequences. “This is a huge regional and geopolitical problem for the United States moving forward,” he said. “Hostages are now currency in this war on terror. That’s always dangerous for both diplomats, air workers, soldiers on the battlefield.”