Aminu Tambuwal's Defection to APC Warrants Resignation as House Leader Says PDP

According to the Guardian newspaper,

In a statement, the PDP’s National Publicity Secretary, Olisa Metuh, said “after a thorough consideration of the matter, the NWC came to a conclusion that the speaker, as a responsible elected officer, knows full well what is needful and honourable of him since his new party is in the minority.

‘‘We are not unmindful of the fact that Tambuwal became Speaker on the platform of the PDP as the political party with the majority of seats in the House of Representatives and that this incontrovertible fact has not changed.”
And speaking with journalists in Abuja yesterday, chairman of the PDP Governors Forum and Governor of Akwa Ibom State, Godswill Akpabio, said the entire PDP governors believed that Tambuwal should resign.
  He said: “For me, we had always suspected that the Speaker of the House of Representatives was in name a PDP member but in action, an opposition party member and so, what has happened today (yesterday) is a culmination of what we had always suspected and I do expect that being an Honourable member which he is, I will also expect that as a man of integrity, he knows the right thing to do that he was elected on the platform of PDP and today he has defected to the opposition and there is no crisis or division in PDP, so the law is very clear and the constitution is very clear.”