Mr Bankole said the final decision at the workers’ parliament, which would hold on June 27, would determine the scope of the intended strike.
Mr El-Rufai’s placing of a bounty on Mr Wabba contrasts his handling of banditry in Kaduna.
On Wednesday, Kano government announced that it would be reverting to the N18,000 minimum wage.
The union is protesting about the payment of a national minimum wage and the use of a government payroll scheme.
The unions meet tonight to go over the resolutions reached by government and labour leaders Sunday night.
