Unconfirmed reports abound that Senator Juan Miguel "Migz" Zubiri will be resigning from his post Wednesday.
Reports say Zubiri will announce his resignation in a privilege speech, 3 pm.
This, amid fresh revelations by Maguindanao election supervisor Lintang Bedol of alleged fraud in the 2007 elections.
An administration bet, Zubiri landed the 12th and last spot for the Senate, narrowly defeating opposition bet, lawyer Aquilino "Koko" Pimentel III.
Pimentel has since contested Zubiri's win and sought but failed to get the high court's restraining order on Zubiri's proclamation.
Zubiri was proclaimed Senator on July 2007 with 11,001,730 votes, a little over Pimentel's 10,983,358.
In a telephone interview, former Senator Aquilino "Nene" Pimentel Jr. said he is also waiting for Zubiri's announcement.
"I will wait until it happens," Pimentel told Yahoo! Southeast Asia.
Pimentel said should Zubiri abandon his post, he is hoping his son Koko could soon get the post.
"We are hoping it will happen sooner or later," he said, noting that Koko still have less than two years to work in the Senate.