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President Ali Abdullah Saleh, in power since 1978, has faced mounting pressure to leave office from continuing protests against his rule, and defections by top military, tribal and religious leaders.
"It is unacceptable and illogical to override the constitutional legality or for the minority to impose its will on the majority of the people," the General People's Congress party said
The party's political bureau said Al-Islah's allies included parliamentary opposition parties, northern Shiite rebels and Al-Qaeda, Saba said.
It also said that three million people turned out on Friday to express their support for the embattled Saleh.