Sani reportedly resigned from the party after disagreements over the party's senatorial primaries in Kaduna.
The letter read;
RESIGNATION FROM THE ALL PROGRESSIVES CONGRESS
Sir,
I Present to you my highest compliments and wish by this communication to formally offer to you my resignation from the All Progressives Congress (APC).
I had joined the APC and remained with it against all odds in the belief that it will constitute a veritable platform for the realization of those democratic ideals which I hold wry dear, that honor and integrity will be the ultimate ethos of the party and, most importantly, that internal party democracy will always be the norm. However, only posterity can affirm the extent to which the APC has committed to and reflected these values.
As I exit the APC, at this point in time. I wish to formally thank the party for availing me the platform upon which I am currently serving this country in the honored capacity of Senator of the Federal Republic.
I wish the party well in all her future endeavors and ask, Sir, that you please, accept the assurance of my highest considerations.
I remain,
Yours faithfully,
Senator Shehu Sani