
The senators were sworn in during plenary on Wednesday.
Gumau emerged winner of the Bauchi South Senatorial election held on Aug. 11.
Gumau, who was a member of the House of Representatives, replaced late Sen. Ali Wakili, who died on March 17.
Meanwhile, Babba-Kaita who was declared winner of the Katsina North Senatorial election, replaced Sen. Mustapha Bukar, who died on April 4.