WASHINGTON — U.N. Ambassador Susan Rice is meeting with key lawmakers in what could be her final pitch for their support if she is nominated to be the next secretary of state.

The discussions, beginning Tuesday, will focus on her much-maligned explanations of the attack on the U.S. Consulate in Benghazi, Libya, that killed the U.S. ambassador and three other Americans, officials said, but she's also clearly auditioning for America's top diplomatic job.

Despite lingering questions over her comments five days after the Benghazi attack, Rice has emerged as the front-runner on a short list of candidates to succeed Hillary Rodham Clinton, with Sen. John Kerry, D-Mass., seen as her closest alternative. But despite a softening of Republican opposition to Rice, she still has work to do to ensure that enough GOP senators are willing to back her potential nomination.