Carney: Obama 'Very Concerned About the Whereabouts of the Plane'

The Wall Street Journal reported Friday night that the investigation, at least on the U.S. end, was quickly turning toward sabotage committed by one or more people aboard the plane.

Jeh Johnson, the new secretary of Homeland Security, faced questions at a Thursday budget hearing of the Senate Homeland Security and Governmental Affairs Committee about the concern of stolen passports being used by two Iranians aboard the missing flight.

"Can you describe what gap in the system that represents, and can you tell us anything about that?" Sen. Ron Johnson (R-Wis.) asked the secretary.

Jeh Johnson said, "I asked the same question."

"What I can tell you is that, at least with the United States government, we do a pretty good job of checking the Interpol database for stolen passports," the DHS director replied. "…And other nations don't quite have the same capability. And we need to focus on, you know, on this more globally."

When the senator asked if the security was more stringent for flights from Malaysia to the U.S. than Malaysia to China, Johnson said he was "not sure of the answer to that."

"But I'm told that flights from last-points-of-departure airports to the United States were pretty good at picking up stolen passports," he added.