Washington has long been a close ally of Egypt.
But Barack Obama’s reaction to Mubarak’s speech appeared to contain clear warnings that its support for the 82-year-old could not be taken for granted.
The US president said: “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 and suppressing ideas never succeeds in making them go away.
“What’s needed now are concrete steps that advance the rights of the Egyptian people”
Obama is also said to have told Mubarak last night that the annual US aid package to Egypt, worth more than a billion euros, is at stake.