Who calls a special election to fill a vacancy in the senate?
The Seventeenth Amendment now requires the governor of the state to issue a writ for a special election to fill a vacant Senate seat, but no timeframe is specified in the provision for when the special election is to be held. State legislatures may also empower the governor to fill a vacancy by a temporary appointment until the winner of the special election is certified. The constitution does not set out how the temporary appointee is to be selected (eg., there is no federal requirement that the appointee be of the same party, as happened most recently in New Jersey in 2013), and the state legislature can legislate as to how the replacement is to be selected.
Who calls a special election to fill a vacancy in the senate in the United States?
governor governor of the state
List of special elections to the United States Senate
No context provided
Who calls a special election to fill a vacancy in the senate in the Phillipines?
Commission on Elections
List of special elections to the United States Senate
https://en.wikipedia.org/wiki/List%20of%20special%20elections%20to%20the%20United%20States%20Senate
List of special elections to the Philippine Congress
https://en.wikipedia.org/wiki/List%20of%20special%20elections%20to%20the%20Philippine%20Congress
The Seventeenth Amendment now requires the governor of the state to issue a writ for a special election to fill a vacant Senate seat, but no timeframe is specified in the provision for when the special election is to be held. State legislatures may also empower the governor to fill a vacancy by a temporary appointment until the winner of the special election is certified. 
List of special elections to the United States Senate
In Batas Pambansa Bilang (B.P. Blg.; National Law No.) 881, or the Omnibus Election Code of the Philippines, approved on December 3, 1985, in case of a vacancy in the Batasang Pambansa (National Parliament) 18 months or more before a regular election, the Commission on Elections shall call a special election to be held within sixty days after the vacancy occurs; in case parliament is dissolved, the President shall call an election which shall not be held earlier than forty-five nor later than sixty days from the date of such dissolution.
List of special elections in the Philippines
In the United States, the governor of the state calls a special election to fill a vacancy in the senate. The Seventeenth Amendment now requires the governor of the state to issue a writ for a special election to fill a vacant Senate seat and state legislatures may also empower the governor to fill a vacancy by a temporary appointment until the winner of the special election is certified. In the Philippines, the Commission on Elections calls a special election to fill a vacancy in the senate. According to the Omnibus Election Code of the Philippines, approved on December 3, 1985, in case of a vacancy in the Batasang Pambansa 18 months or more before a regular election, the Commission on Elections shall call a special election to be held within sixty days after the vacancy occurs; in case parliament is dissolved, the President shall call an election which shall not be held earlier than forty-five nor later than sixty days from the date of such dissolution.