(S (S (BASENP (DT The) (NN administration)) (VP (VBZ has) (VP (ADVP (RB also)) (VP (VBN been) (VP (VBN pressured) (S (VP (TO to) (VP (VB redefine) (NP (BASENP (DT the) (NN role)) (PP (IN of) (NP (BASENP (NNP America) (POS 's)) (BASENP (JJ nuclear) (NN arsenal))))))))))))) (PERIOD .))