Who is Rotimi Amaechi referring to in this tweet?

Current Minister of Transport and former Governor of Rivers State, Rotimi Amaechi has denied allegations that he misappropriated the sum of N82 million to organise a dinner for Nobel Laureate. Wole Soyinka, when he was governor. Amaechi called it falsehood, only spread to smear his name. He asked the current governor to go to court if he feels he has a case of fraud