(S (S (BASENP (PRP It)) (VP (ADVP (RB also)) (VP (VP (VBD ordered) (NP (NP (BASENP (DT the) (NNP Secretary)) (PP (IN of) (BASENP (NNP Homeland) (NNP Security)))) (BASENP (NNP Michael) (NNP Chertoff)))) (S (VP (TO to) (VP (VB conduct) (NP (BASENP (DT a) (NN study)) (PP (IN of) (NP (NP (DT the) (BASENP (NN necessity) (CC and) (NN feasibility))) (PP (IN of) (NP (BASENP (DT the) (NN construction)) (PP (IN of) (NP (BASENP (DT a) (QT (DQL ``) (BASENP (JJ state-of-the-art) (NN barrier) (NN system)) (DQR ''))) (PP (IN along) (BASENP (DT the) (JJ Canadian) (NN border)))))))))))))))) (PERIOD .))