WASHINGTON - Senate Republicans said they will create a road block if President Obama names United Nations Ambassador Susan Rice as the next Secretary of State.

The president is calling Rice 'extraordinary' as she faced scrutiny over her initial comments about the deadly attack on the U.S. Consulate in Libya.

Rice faced a second day of questioning on Capitol Hill, followed by a show of support from the president and his cabinet members.

Some lawmakers fault Rice's early explanation of the September attack that killed four Americans, including U.S. Ambassador Chris Stevens.

If she was nominated, Rice would likely need 60 votes to overcome a filibuster by GOP Senators.

That means she would need five Republicans to cross over.