A top White House official clammed up Sunday under questioning about the extent of President Obama’s involvement in investigating his administration’s security leaks — even as officials warned the leaks are so severe as to potentially trigger a cyberattack by Iran.

Further, Sen. Joseph Lieberman, I-Conn., on “Fox News Sunday,” put added pressure on the administration over the leaks by breaking with the president and calling for a special counsel to investigate.

The two U.S. attorneys chosen from the Justice Department to investigate, Lieberman said, are “not enough” to avoid “any appearance of conflict of interest.”

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