One of the concerns other countries have regarding the Islamic State is citizens who have trained with the terrorist group using their passports to return home and carry out an attack, The Daily Signal reported.
On "Fox News Sunday", Rep. Mike Rogers, R-Mich., told host Chris Wallace there are "hundreds" of Americans connected to the Islamic State.
"The problem is there is no sure number," Rogers, chairman of the House Intelligence Committee, said. "It's in the hundreds that we believe have at least [at] one time traveled and participated and trained with them."
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