According to Section 143 of the 1999 Constitution of di Federal Republic of Nigeria, here are the steps to impeach the president.
There must be a notice of an allegation, alleging gross misconduct on the part of the President and it has to be signed by not less than one-third of the members of the National Assembly and it will be given to the Senate President.
The Senate President must within 7 days, present to the President and each member of the National Assembly a copy of the notice of allegation.
The President has the right to reply to any type of statement to reply to the allegation that must be served on each member of the National Assembly.
Within 14 days of the notice presented to the Senate President, each chamber of the National Assembly has to resolve by motion, without debate whether or not to investigate the allegation. The motion has to pass by a two-thirds majority of the National Assembly.
If the motion fails to reach a two-thirds majority, the process will stop immediately. However, if the motion is passed, the Senate President will pass the motion in 7days, and request the Chief Justice of Nigeria to appoint a panel to investigate di allegations.
The President being investigated, under this step will have the right to defend himself in person and will be represented by legal practitioners of his own choice.
A panel will be appointed to: Get the power and exercise in function according to the procedure prescribed by the National Assembly; and report findings to each House of the National Assembly within three months of appointment.
Where the reports on the allegation are not proven, there will be no further action. But if the allegation against the President is proven, then the report will be considered by the National Assembly.
For the resolution to be adopted, it has to be supported by not less than two-thirds majority of all the members of each House. Once it is adopted, the President will be removed from office henceforth.