(a) The Supervisor of Elections or his deputy shall forthwith examine the nomination petitions, nomination papers or nomination certificates filed with him under this chapter and shall permit them to be examined by any interested citizen. If the identity of any signer is unknown to him or if the identity or capacity of any signer seems to him doubtful or is challenged by any citizen, the Supervisor of Elections or his deputy within three days after the close of the nomination period shall hold a public hearing in the election district in which the signer in question purports to reside, to which hearing such signer and any material witnesses may be summoned. The Supervisor of Elections or his deputy shall determine the signer's identity and capacity and ascertain that the candidates have been validly nominated.
(b) If the Supervisor determines that a candidate for election or nomination does not meet the qualifications established by law for the office, then he shall disqualify such candidate and delete the candidate's name from the ballot if the ballots have not been printed.
(c) When a nomination petition, nomination paper or nomination certificate is found to be defective the candidate shall be notified immediately by special messenger with the reason or reasons therefor. If a new, valid petition, paper or certificate is not filed within three days thereafter the candidate shall be disqualified for nomination or election.