The three new nominees for that constituency were Roger Watts, a panman; Shari Reynald, a human resource professional and Christian Chandler, an attorney.
"None were accepted, which means the door is closed at the moment and Diego Martin Central will have to come with new nominees," said PNM general secretary Ashton Ford, after yesterday's six-hour session at Balisier House, Port-of-Spain, which ended after 10 pm.
Ford said the new nominees must be submitted by next week Friday.
The screening committee also failed to approve any candidate for the Chaguanas East constituency after the chosen candidate, Opposition Senator Diane Baldeo-Chadeesingh withdrew. Ford said the constituency was asked to recommend for a second screening one of the other six candidates who were screened with Baldeo-Chadeesingh, but the constituency failed to do so. He said the constituency has "to continue the search" for a new candidate.
Like the Diego Martin Central constituency, Chaguanas East has until April 24, to find new nominees.
Barataria / San Juan was the other constituency screened last night. That constituency recommended Hashim Al-Mujaahid. Sources said, however, that the committee needed a few days to do background checks and hold further discussion before making a decision on his nomination.
There were only a few supporters at Balisier House last night for the screening, which was chaired by party leader Dr Keith Rowley, who declined to comment on the exercise.
The PNM has already completed screening for 38 constituencies.
Prime Minister Kamla Persad-Bissessar is expected to call general elections no later than September.