United 93 and the Shootdown Order On the morning of 9/11, the President and Vice President stayed in contact not by an open line of communication but through a series of calls.
( ( ( ( United 93 ) and ) ( the ( Shootdown Order ) ) ) ( ( On ( ( the morning ) ( of 9/11 ) ) ) ( , ( ( the ( President ( and ( Vice President ) ) ) ) ( ( ( stayed ( in contact ) ) ( not ( ( ( by ( ( an ( open line ) ) ( of communication ) ) ) but ) ( through ( ( a series ) ( of calls ) ) ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (NP (NNP United) (CD 93)) (CC and) (NP (DT the) (NNP Shootdown) (NNP Order))) (PP (IN On) (NP (NP (DT the) (NN morning)) (PP (IN of) (NP (CD 9/11))))) (, ,) (NP (DT the) (NNP President) (CC and) (NNP Vice) (NNP President)) (VP (VBD stayed) (PP (IN in) (NP (NN contact))) (PP (RB not) (PP (IN by) (NP (NP (DT an) (JJ open) (NN line)) (PP (IN of) (NP (NN communication))))) (CC but) (PP (IN through) (NP (NP (DT a) (NN series)) (PP (IN of) (NP (NNS calls))))))) (. .)))
For security reasons, the President did not maintain an open line of communication with anyone on the morning of 9/11.
( ( For ( security reasons ) ) ( , ( ( the President ) ( ( ( did not ) ( ( ( maintain ( ( an ( open line ) ) ( of communication ) ) ) ( with anyone ) ) ( on ( ( the morning ) ( of 9/11 ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (IN For) (NP (NN security) (NNS reasons))) (, ,) (NP (DT the) (NNP President)) (VP (VBD did) (RB not) (VP (VB maintain) (NP (NP (DT an) (JJ open) (NN line)) (PP (IN of) (NP (NN communication)))) (PP (IN with) (NP (NN anyone))) (PP (IN on) (NP (NP (DT the) (NN morning)) (PP (IN of) (NP (CD 9/11))))))) (. .)))