At the United Nations, Rice has traded barbs with her Russian counterpart and is known to be a tough negotiator. Her diplomatic style has been described as ‘no-nonsense’ and ‘abrasive.’ But David Bosco believes her personality would not define her if she became the top American diplomat.

"The position carries such weight, that whether she is an engaging personality, or outgoing, gregarious, is something that I think isn’t going to be highly relevant for her success as secretary," Bosco said.

After the September 11 attack on the US consulate in Benghazi, Rice suddenly found herself at the center of a battle between the White House and Capitol Hill Republicans.

Republican Senators, including South Carolina’s Lindsey Graham, say they will oppose her nomination based in part on comments she made on several American news programs five days after the attack that killed four Americans.

“I don’t think she deserves to be promoted," Graham said. "There are a lot of qualified people in this country the president could pick, but I am dead set on making sure we don’t promote anybody that was an essential player in the Benghazi debacle.”

A meeting between the senators and Ambassador Rice did not appear to ease their doubts. But she still has the support of President Obama.

“Susan Rice is extraordinary. Couldn’t be prouder of the job she’s done,” the president said.

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