The Philippine Supreme Court did not announce an expected decision Monday on whether a new U.S.-Philippine security agreement is constitutional, a spokesman said, a setback for U.S. President Barack Obama as he heads for Manila to attend an Asia-Pacific summit.

A court source said last week that the court is likely to uphold the constitutionality of the deal, and that a formal decision from the 15-judge bench would be made Monday, ahead of Obama's arrival on Tuesday.

Supreme Court spokesman Theodore Te said after the court closed for the day that he had not received any word of a ruling.