The defense secretary submitted his letter of resignation to President Obama. Officials say he will remain in his current position until his replacement is confirmed by the Senate. NBC Pentagon correspondent Jim Miklaszewski reports.
On Sunday an unidentified manran a gate at the U.S. Army post in San Antonio, Texas, and was stopped by security. Explosive materials were reportedly found in his car. NBC Pentagon correspondent Jim Miklaszewski reports.
NBC News' Jim Miklaszewski and Chris Jansing have more on the resignation of Secretary of Defense Chuck Hagel.
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