Manila, June 13 -- The vote of the impeachment court on the case of Vice President Sara Z. Duterte must be based on the number of participating senator-judges, a key member of the House prosecution said on Saturday.

Manila 3rd District Rep. Joel Chua said it would be "unfair" if absent senators would be allowed to cast votes.

The trial starts July 6.

"Paano magiging fair 'yon on the part of defense at sa amin kung buong trial ay hindi siya nakapag-participate, wala siya doon tapos hihingin ang boto niya. Paano nagkaroon ng fair justice doon (How can it be fair on the part of the defense and us if he didn't participate in the entire trial. Where is fair justice there)?" he said at tbe Saturday News Forum in Quezon City.

Chua, who also...