(S (S (NP (BASENP (DT The) (NNS ministers)) (PP (IN of) (NP (BASENP (NN immigration)) (CC and) (BASENP (JJ public) (NN safety))))) (VP (VBP are) (VP (VBN obliged) (S (VP (TO to) (VP (VB sign) (BASENP (DT the) (JJ national) (NN security) (NN certificate)))))))) (PERIOD .))