"Claim" is the operative word.
You suggest that we've found and disarmed several, if so, why are the jihadis waiting?
Answer: They don't have anything but they'd like us to believe that they do. Nice thing about pretending to have one, they don't risk having it found and disarmed.
Methinks if they had a nuke they'd have detonated it by now, especially if we've found and disarmed them in the past.
Fine. Let's revisit the topic after the elections in November. They took 8 years to engineer the re-run against the WTC. They are clearly more interested in results than meeting some arbitrary time table.