(S (S (S (BASENP (JJ American) (JJ presidential) (NN candidate) (NNP John) (NNP McCain)) (VP (VBD suggested) (SBAR (IN that) (S (BASENP (PRP it)) (VP (VBD justified) (NP (BASENP (NNP US) (NNS proposals)) (S (VP (TO to) (VP (VP (VB construct) (BASENP (DT a) (NN missile) (NN defense) (NN system))) (PP (IN in) (BASENP (NNP Eastern) (NNP Europe)))))))))))) (COMMA ,) (SBAR (IN whilst) (S (BASENP (PRPD his) (NN opponent) (NNP Barack) (NNP Obama)) (VP (VP (VBD described) (NP (BASENP (NNP Iran) (POS 's)) (BASENP (NN missile) (NN program)))) (PP (IN as) (NP (DT a) (QT (DQL ``) (BASENP (JJ great) (NN threat)) (DQR '')))))))) (PERIOD .))