President Muhammadu Buhari has said that the anti-graft war is tough and gruelling, "with corruption fighting vigorously back."
He said corrupt people had accumulated a formidable arsenal of illicit wealth, which they were now deploying against his administration on diverse fronts.
President Buhari, however, assured that the battle would be won.
The president spoke in Marrakech, Morocco on Wednesday while meeting with American Secretary of State, John Kerry, on the margins of conference on climate change, COP22.
"But it is a war we are determined to win, and which we will win. People of goodwill are behind us. Countries like America and many others are with us, and we will surely win," he stated.
He updated Kerry on the war against insurgency in the Northeast of Nigeria and the efforts being made to tackle humanitarian problems caused by terrorism.
The president told the US Secretary of State that a presidential committee had been launched "under Gen T.Y Danjuma, a man of high integrity."
On the unrest in the Niger Delta area which is manifesting in the sabotage of critical oil and power installations, Buhari said the engagement process was proceeding apace, adding that it was rather difficult bringing the main protagonists of the insurgency under one umbrella.
He said Nigeria was happy with American support on different fronts, assuring that the economic challenges facing the country were being "frontally tackled, and we will overcome them soon."
Kerry pledged continuous U.S support to Nigeria in the bid to overcome security, humanitarian, political, and economic challenges.
As the Barrack Obama administration exits next January, Kerry said he would love to continue engaging with Nigeria, even in a private capacity.
He described President Buhari as a strong international partner in the battle against violent extremism.