Rep. Peter King (R-N.Y.) said Sulaiman Abu Ghaith was caught in Jordan within the last week, calling it a "very significant victory."
According to officials, Ghaith took part in the Sept. 11, 2001, plot against the U.S.
King said U.S. law enforcement officials confirmed the capture.
"I commend our CIA and FBI, our allies in Jordan, and President [Barack] Obama for their capture of al-Qaeda spokesman Sulaiman Abu Ghaith. I trust he received a vigorous interrogation, and will face swift and certain justice," King said in a statement.