Internal U.S. government reviews have determined that a mass leak of diplomatic cables caused only limited damage to U.S. interests abroad, despite the Obama administration’s public statements to the contrary.

A congressional official briefed on the reviews said the administration felt compelled to say publicly that the revelations had seriously damaged American interests in order to bolster legal efforts to shut down the WikiLeaks website and bring charges against the leakers.

“I think they just want to present the toughest front they can muster,” the official said.