US Secretary of State John Kerry said Friday he would "evaluate" the next steps in the Middle East peace process with President Barack Obama, warning there are "limits" to Washington’s time.

US Secretary of State John Kerry said Friday he would "evaluate" the next steps in the Middle East peace process with President Barack Obama, warning there are "limits" to Washington's time.

"I will be having conversations with the administration today, including the president, and we're going to evaluate exactly what is possible and what is not possible," Kerry told a press conference in Rabat.

He said the peace process was not "open-ended," and that it was now time for a "reality check".

"There are limits to the amount of time and effort that the United States can spend if the parties themselves are unwilling to take constructive steps," the top US diplomat warned.