By Paul Carsten ABUJA (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. Saraki has been tipped as a possible eventual successor to the ailing Buhari, who has spent more time this year in Britain receiving treatment for an undisclosed medical problem than he has in Nigeria.



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