ISLAMABAD, Pakistan — President Musharraf is running out of options. Legal complexities may save him in the short-term, but few expect him to hold on for long, raising fresh uncertainty over Pakistan’s support for the aggressive American approach to fighting radical Islamic groups.

The declaration by the winners of last month’s parliamentary elections that they will form a coalition government and reinstate judges sacked by Mr. Musharraf has robbed the president of his last trump card: division in the political opposition.

Parliament is to convene in the next week or so. Within a month of the new Cabinet being formed, the ruling parties say they will vote to restore the judges — setting up a legal fight with Mr. Musharraf that could drag on for weeks or months but which he has little prospect of winning.

“The die is pretty much cast for him,” a Pakistani political analyst and a fellow at Harvard University’s Asia Center, Nasim Zehra, said.

A year of turmoil triggered by Mr. Musharraf’s clumsy attempt to oust the independent-minded chief justice robbed him of public support. He has since lost the aces he held for most of his eight-year rule: command of the army, a supportive parliament, and unqualified Western backing.