WASHINGTON (CNN) -- Secretary of State Condoleezza Rice will officially announce the U.S. support of an Iraqi regional conference Tuesday in a Senate Appropriations Committee hearing.

"Success in Iraq requires the positive support of Iraq's neighbors," Rice will say according to prepared remarks released by the State Department. "This is also one of the key findings of the Iraq Study Group. So I'm pleased to inform you that the Iraqis are launching a new diplomatic initiative that we fully support."

"I would note that the Iraqi government has invited Syria and Iran to attend both of these regional meetings," Rice will add. "We hope these governments seize this opportunity to improve their relations with Iraq -- and to work for peace and stability in the region."

Rice is calling the conference a "new diplomatic offensive" that aims "to build greater support, both within the region and beyond, for peace and prosperity in Iraq."

The committee hearing is scheduled to begin at 2:30 p.m. ET.