Schiff said he has seen no evidence linking the latest warnings to that agency's collection of "vast amounts of domestic data."
Other lawmakers defended the administration's response and promoted the work of the NSA in unearthing the intelligence that lead to the security warnings.
"The bottom line is ... that the NSA's job is to do foreign intelligence," Ruppersburger said. "The whole purpose is to collect information to protect us."
Added King, a frequent critic of President Barack Obama, "Whether or not there was any controversy over the NSA at all, all these actions would have been taken."
Friday's warning from the State Department urged American travelers to take extra precautions overseas, citing potential dangers involved with public transportation systems and other prime sites for tourists. It noted that previous terrorist attacks have centered on subway and rail networks as well as airplanes and boats. It suggested travelers sign up for State Department alerts and register with U.S. consulates in the countries they visit. The alert expires Aug. 31.
The statement said al-Qaida or its allies might target either U.S. government or private American interests.