Sansern Poljiak, secretary-general of the NACC, insisted that Vichet Kasemthongsri, former deputy transport minister, would be summoned for questioning because the anti-graft agency had evidence pointing to his alleged involvement.
Vichet meanwhile said he had no role in those bribery case.
At this stage, Sansern said no details could be disclosed but the agency believed Vichet was one of the 26 persons of interest who must be questioned in connection with the scandal.