The notices of their resignation and defection are contained in three separate letters read during plenary by the President of the Senate President, on Tuesday.
While Kaita and Alimikhena defected to the opposition Peoples Democratic Party (PDP), Gumau, on the other hand, defected to the New Nigeria Peoples Party (NNPP).
Kaita’s letter reads, “As senator representing Katsina North Senatorial District, I write to formally notify you of my resignation from the APC and registration declaration for the PDP.
“My resignation from the APC was borne out of the marginalisation of critical stakeholders by the State Government and Leadership of the Party in Katsina State, where small people like me do not have a chance.
“I have since been joyfully and graciously accepted into the fold of the Peoples Democratic Party in Katsina State.”
On his part, Alimikhena, explained that his decision to resign from the APC was as a result of “continuing and multifaceted crisis that has bedeviled the APC in his senatorial district.
“This has created parallel executives that has undermined internal discipline, cohesion and focus.”
The defection by the three lawmakers has reduced the total number of APC senators from 70 to 67 in the upper chamber.