(CNN) -- President Barack Obama spoke with Egypt's president moments after Hosni Mubarak addressed his country, telling the Egyptian that he must make good on his promises and avoid a violent response to the thousands of protesters in the streets. With parts of his capital ablaze, Mubarak said he was asking his government to resign and would soon announce a new one, pledging to address the concerns of thousand of Egyptians protesting in Cairo's streets. "I just spoke to him after his speech," Obama said, "and told him he has a responsibility to give meaning to those words, to take concrete steps and actions that deliver on that promise. Violence will not address the grievances of the Egyptian people. Suppressing ideas never succeeds in making them go away.
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NEW: Obama calls Mubarak and tells him to openly address his people's grievances
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Privately, officials worry that Mubarak may be underestimating the protests
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Mubarak asks the government to resign
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Gibbs said the U.S. will review its "assistance posture" to Egypt
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@placeholder, they said, has two choices: to embrace meaningful reforms or to continue the crackdown.
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He has not called Egyptian President Hosni Mubarak, the target of the protesters' anger, "but there is daily contact between the U.S. and Egyptian governments through various channels, including the embassies and other organizations in which @placeholder's messages and concerns are relayed," Vietor said.
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"I think that, if anything, one might ask why hasn't President @placeholder called President Obama and said, 'Are you with me or against me?'
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"I think that, if anything, one might ask why hasn't President Mubarak called President @placeholder and said, 'Are you with me or against me?'