Islamabad, Pakistan (CNN) -- Pakistan's upper house of parliament passed a resolution demanding Pervez Musharraf be arrested and tried for treason for unconstitutional acts during his regime, a senator said.
The resolution is not binding, but is symbolic and shows the will of the senate, said Muhammad Ibrahim Khan.
The resolution, passed Monday, is part of ongoing pressure on Musharraf, who seized power in a 1999 coup and has been living in exile in London and Dubai since resigning in 2008.
Muhammad Ali Saif, a senior leader in Musharraf's party, dismissed the resolution.
"We don't care about it as it has no value," he said. "Let the lawmakers pass whatever resolution they want."
Musharraf announced plans to return from exile in late January and run in upcoming elections -- but his party said he was reassessing those plans when Pakistan's elected government warned that if he returned, he faced arrest in connection with the 2007 assassination of former Prime Minister Benazir Bhutto.
A U.N. report in 2010 accused Musharraf's government of failing to protect Bhutto, who had returned to Pakistan from her own exile to run for office. Musharraf has denied the allegations, arguing that Bhutto had police protection and took unnecessary risks, but a Pakistani court has issued a warrant for his arrest.
Bhutto's widower, Asif Ali Zardari, is now Pakistan's president.