(Wall Street Journal) Iran’s infiltration of a Navy computer network was far more extensive than previously thought, according to officials, and the officer who led the response will likely face questions about it from senators weighing his nomination as the next head of the embattled National Security Agency.

It took the Navy about four months to finally purge the hackers from its biggest unclassified computer network, according to current and former officials.

Some lawmakers are concerned about how long it took. When Vice Adm. Michael Rogers, President Barack Obama’s choice for the new NSA director, faces his confirmation hearing, some senators are expected to ask whether there is a long-term plan to address security gaps exposed by the attack, congressional aides said. The hearing hasn’t been scheduled yet, but could be next month.

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