I would take him away from the table and put him on the potty/toilet and tell him to stay there till hes done....if he says hes done and he hasn't done anything then I would say "nope sorry you haven't done anything yet keep trying" .....and keep going till he either goes or he goes back to the table to eat. he'll figure it out soon enough which is the lesser of two evils.
Always ensure that your child receives quality care by taking the time to investigate the provider and by asking for references! We simply cannot verify the claims of every daycare provider.
Updates
We expect providers to keep their listing and available openings up-to-date. However, to prevent oversights, openings expire after 45 days.