The businessman said it was an "honour" to serve in the post, but the BBC understands he feels he has achieved all he can in the role.
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The person in charge of the country will change but the financial challenges remain the same.
BBC's Azadeh Moshiri reports as thousands attempt to march to India's parliament in support of the Cockroach Janta Party's demand for education reforms.
The latest National Police Service report recorded more than 600 assaults on recruitment officers to date and warned that the aggression has become “increasingly threatening”.
A 3D-printed battery designed at Queen's University Belfast could speed up energy storage research.
The protest-hit Sustainable Farming Scheme has been introduced after almost a decade in development.
Aggression against recruitment officers has become increasingly threatening, police say.
Determined to hit the ground running, the former mayor hopes to maintain the leadership style he adopted in Manchester.
Colombians who grow cocaine's raw material bemoan a lack of support to help them switch crops.
Robbie Williams and Jennifer Hudson also performed, with Kylie Jenner and Timothee Chalamet among the celebrities in the crowds.