(S (S (NP (BASENP (DT A) (VBN leaked) (NN draft)) (PP (IN of) (NP (BASENP (DT a) (NN report)) (PP (IN on) (NP (BASENP (NNS instances)) (PP (IN of) (NP (BASENP (NN state) (NN repression)) (PP (IN during) (NP (BASENP (NNP Mexico) (POS 's)) (QT (DQL ``) (BASENP (JJ dirty) (NN war)) (DQR ''))))))))))) (VP (VBZ has) (VP (VBN been) (VP (VP (VBN called) (PP (IN into) (BASENP (NN question)))) (PP (IN by) (BASENP (JJ top) (NNS officials))))))) (PERIOD .))