Washington ? President Barack Obama said Saturday the $787 billion stimulus program must be given a chance to work before consideration is given to a second such jolt for the still-ailing economy.

Obama acknowledged in his weekly radio and Internet address that people are getting nervous about continuing high joblessness — the unemployment rate hit 9.5 percent in June — but said reversing payroll losses takes time. He asked Americans to be as patient as possible.

Republicans have labeled the $787 billion stimulus a failure. Both Obama and Vice President Joe Biden have argued that the bulk of the money from the stimulus program is still being disbursed and that it already has saved many jobs.

Obama criticized Republicans for opposing the stimulus but offering few alternatives to the worst recession since the Great Depression. And he rejected talk of a second stimulus, an idea that has been discussed by Democrats and even famed investor Warren Buffett.