Mr Lawal was removed from the position last year following allegations that he had diverted funds intended for the humanitarian crisis in the north-east Nigeria. But he came into the sights of the Economic and Financial Crimes Commission (EFCC) over awarding $6m (£4.2m) worth of government contracts to his private company while he was public servant.

Sahara Reporter says the contracts related to grass cutting.

He has denied any wrong doing.