1987 Philippine Senate election
The 23rd election to the Senate of the Philippines was held on Monday, May 11, 1987. The Senate was re-instituted following the approval of a new constitution in 1987 restoring the bicameral Congress of the Philippines; earlier, a constitution was approved in 1973 that created a unicameral Batasang Pambansa (parliament) that replaced the bicameral Congress.
Source: Wikipedia — 1987 Philippine Senate election (CC BY-SA 4.0)