A tank rolls through downtown Cairo. (Credit AlJazeera English via Creative Commons)

President Barack Obama said Egyptian President Hosni Mubarak needs to deliver on his promise to advance reform in his country Friday.

"This moment of volatility has to be turned into a moment of promise," Obama said after Mubarak addressed Egyptian citizens on state TV early Saturday morning.

President Obama said he spoke to Mubarak over the phone after the Egyptian president's address, where he asked his government to resign and vowed to appoint a new one.

"[I] told him he has a responsibility to give meaning to those words, to take concrete steps and actions to deliver on that promise," Obama said. "Violence will not address the grievances of the Egyptian people. Suppressing ideas never succeeds in making them go away."

Obama's statement was similar in tone to that of Secretary of State Hillary Clinton's speech earlier today, which called for Egyptians to "embrace reform", which only seemed to enhance the view that the Obama administration may not know which side to take.

White House Press Secretary Robert Gibbs also spoke Friday about Mubarak, but refused to confirm that the U.S. completely supported him, as they have in the past.

"We have reached a point where the grievances have to be addressed with concrete reforms; have to, must," he said.

This marked the first time the United States has wavered on their support of Egypt, to who they give almost $1.5 billion in aid per year. Though Gibbs did not indicate standing steadfast behind the Egyptian government, he did say the United States would be reevaluating the aid, which includes military items, in the coming days.