APC national publicity secretary, Bolaji Abdullahi, in a statement, called the development a concrete expression of faith by the APC Senate Caucus in efforts to resolve the lingering issues that trailed the election of Senate leadership.
"We believe this is a major step forward in our efforts to reunite the various interest groups in that Senate election, thereby presenting a common legislative front for our great party," he said.
"We are particularly delighted that the consultations that were initiated towards the end of 2015 between the party caucuses in the National Assembly and the party executives as well as other leading stakeholders of our party has yielded these results and the Senate has demonstrated its willingness to finally submit to the will of the party in this regard.
"With this development therefore, we are confident that the issues arising from the elections in the Senate in 2015 have been put to rest", he added.
APC recalled that the party leadership had resolved that Senator Lawan be compensated with the position of the Senate Leader soon after the issue of election in the Senate occurred.
He said the directive was not fully complied with at the time, but expressed happiness to see the change effected, stressing that it represents a significant progress in efforts to build a strong and united party.
APC congratulated Senator Lawan on his election and expresses hope that he would use his vast experience and knowledge to enhance legislative works and its agenda of change.
APC also assured Nigerians that it would continue to work under the leadership and guidance of President Muhammadu Buhari to resolve any other pending issues that might have affected the party at different levels.
The ruling party also thanked Senator Ndume for his service and sacrifice to the party, which, it added, would not be forgotten.