Constitutional amendment required for open ballot: ECP to SC Pakistan A view of the Senate. — APP/File The Election Commission of Pakistan has stated that in order to switch from secret balloting to an open ballot method, an amendment to the Constitution will be required. The above observation has been made in the ECP's written response to the Supreme Court in the presidential reference filed seeking an opinion from the court on the way Senate elections are held. The ECP said that the Senate elections, much like the elections for the prime minister and the president, fall under the Constitution.