Local media have cited sources that said she resigned because of the reports that she had not duly served her one-year national service and by law was unfit to hold a government position.
"The PDP is also aware of plots by the Federal Government to secretly move her out of the country, and for that, we urge the global community to be at alert and ensure she is repatriated to face justice in Nigeria should the Federal Government succeeds in its devious plan".
The resignation followed the allegation of not serving the compulsory National Youth Service Corps, NYSC, and obtaining a certificate that the NYSC have disowned.
Adeosun was appointed by Buhari to manage the finances of Africa's biggest economy in November 2015. She also instituted a whistle-blower policy and helped push reforms to boost Nigeria's tax collection to increase non-oil revenue as the West African nation seeks to wean itself off oil.
The west African country emerged from recession past year, but growth remains sluggish and largely dependent on higher oil prices, despite the stated aim of Buhari's administration to increase non-oil revenues.