REPUBLIKA.CO.ID, WASHINGTON -- US Defense Secretary Chuck Hagel resigned on Monday, the first major change to President Barack Obama's Cabinet since his Democrats were routed in midterm elections three weeks ago.

Obama announced the resignation at a White House event with Hagel at his side. Hagel will remain in the job until a successor is in place. Hagel was appointed less than two years ago as Obama pushed his signature program of winding up wars in Afghanistan and Iraq, a process that is being upended this year with US re-engagement in Iraq and greater military cooperation with Kabul.

The former Republican senator, who had struggled to improve his ties with Congress after a contentious 2013 confirmation hearing, submitted his resignation letter after lengthy discussions with Obama that began in October, officials said.

"A successor will be named in short order, but Secretary Hagel will remain as Defense Secretary until his replacement is confirmed by the United States Senate," a senior Obama administration official said.

Hagel raised questions about Obama's strategy toward Syria in a two-page internal policy memo that leaked this fall. In it, he warned that Obama's policy was in jeopardy due to its failure to clarify its intentions toward Syrian President Bashar al-Assad. Obama has insisted that the United States can go after Islamic State militants without addressing Assad, who the United States would like to leave power.

Top potential candidates to replace Hagel include Michele Flournoy, a former under secretary of defense, and Ashton Carter, a former deputy secretary of defense, who were rumored to be contenders for Hagel's job before he was named. Senator Jack Reed, Democrat of Rhode Island, is another possible contender.

Hagel, who became an outspoken critic of the administration of President George W. Bush, had also upset many in his party by endorsing Obama in his presidential race against Republican Senator John McCain in 2008.

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