Eulogio "Amang" Adona Rodriguez Sr. was a Filipino politician who twice served as President of the Senate of the Philippines. He was known for vehemently confronting corruption during the administration of Carlos P. Garcia, alleging he held a list of corrupt officials close to the president which the media dubbed the "White Paper".

The president of the Senate of the Philippines, commonly referred to as the Senate president, is the presiding officer and the highest-ranking official of the Senate of the Philippines, and third highest and most powerful official in the government of the Philippines. They are elected by the entire body to be their leader. The Senate president is second in the line of succession to the presidency, behind only the vice president and ahead of the speaker of the House of Representatives.