Can someone tell me name of the movie?

a coterie of govt officials higher a ex navy commando to save US president. however it was a scheme and they killed some other person standing besides the president preteding that the person was killed accidently instead the killer wanted to shoot the president. a senator is also involved in that. it reveals that the senator and the coterie had killed number of people in african villagers to lay oil pipelines there. i just remember this much. can someone tell me the name of the movie.