Portugal's president wants something from the Socialist Party before he lets it take power with the support of the Communist Party and radical Left Bloc: a formal commitment to eurozone financial rules and NATO defense agreements.

The three parties forged an anti-austerity alliance almost two weeks ago to force the resignation of the center-right government. They want to run the country under a Socialist government.

President Anibal Cavaco Silva has hesitated to allow that because the Communist Party and Left Bloc have in the past called for Portugal to quit NATO and the 19 countries sharing the euro currency.

The president's office issued a statement Monday saying he had asked Socialist leader Antonio Costa to provide assurances that under his leadership Portugal would abide by its international commitments.