President Muhammadu Buhari on Thursday explained why he would not hurriedly assent to the 2016 passed by the National Assembly.

He said he would critically review the document before assenting to it, according to a statement by Femi Adesina the special adviser to the President on media and publicity.

Speaking at a meeting with the United States Secretary of State, John Kerry, in Washington DC, President Buhari said in view of the controversial alteration and padding of the budget proposals, he needed to review the appropriation bill to be certain that its contents tallied with the authentic budget proposal presented to the National Assembly.

"Some bureaucrats removed what we put in the proposal and replaced it with what they wanted," Mr. Buhari said. "I have to look at the bill that has been passed by the National Assembly, ministry by ministry, to be sure that what has been brought back for me to sign is in line with our original submission."

Declaring that his administration will continue to vigorously prosecute its war against corruption, President Buhari sought and received an assurance from Mr. Kerry that the United States Government will facilitate the repatriation of all stolen Nigerian funds found within the American banking system.

"It will greatly help our country if you assist us to recover all our stolen funds which we can establish to be within your financial system," the President told Mr. Kerry.

Responding, the Secretary of State said that he has been told that the stolen Nigerian funds were in "billions of dollars".

"It's not easy to hide that amount of money and we are pretty good in tracing them," Mr Kerry assured President Buhari, adding that relevant United States Government Officials will meet with the Chairman of Nigeria's Economic and Financial Crimes Commission to discuss further cooperation in that regard.

Mr. Kerry applauded the Buhari administration's success in rolling back the Boko Haram insurgency, saying the United States will continue to give Nigeria all possible support to ensure that the terrorist sect is finally eliminated as a threat to national and regional security.