A potential terror suspect who sneaked into Port Newark appears to also have been recently detained in Colombia — fueling concerns about exactly what he was doing in the United States, Rep. Peter King said yesterday.

“Obviously, security failed,” the Long Island Republican, head of the House Homeland Security Committee, said of suspect Asem Ellbahnsany Haroon.

Evidence suggests he “came here in January in a container or the bow of [an Italian] ship,” King said of the bust, first revealed in The Post. “What I find concerning is . . . that he was in a secure portion of the port, left that facility and then got out of the secure part of the facility and went to a building outside of the secure area.”

There’s also evidence he’d “been detained in Colombia fairly recently,” King said, although it’s unclear why. The United States has fought against Colombian drug thugs for years.

The Port Authority had no comment.