Papandreou is seeking public backing from the Greek people for last week's bailout deal, which took months to reach.
But the move created turmoil in domestic politics, with Papandreou forced to hold an emergency Cabinet meeting late Tuesday, and angered his European counterparts.
Sarkozy and Merkel issued a terse statement on Tuesday saying they were "determined to ensure the full implementation, without delay, of decisions adopted by the summit, which are necessary now more than ever."
White House spokesman Jay Carney struck a similar note, saying Papandreou's move reinforced the need for Europe "to elaborate further and implement rapidly the decisions they made last week."
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