Nigerian Senate backs plans to reduce power of presidency

By Paul CarstenABUJA (Reuters) - Nigeria's upper house of parliament backed a series of constitutional amendments on Wednesday that could weaken the presidency and boost the legislature, the latest twist in a two-year power struggle between the two institutions.The head of the Senate, Bukola Saraki, who is pushing the changes, said they would help boost Nigeria's development but a senior official in President Muhammadu Buhari's government said they amounted to "a very unhealthy" power grab.Sarak