Political Thriller (I think)

Can someone help me out with finding the name of a movie. All I can remember is its a political thriller and there is a scene where there is a guy with a machine guy waiting at the top of some steps, and group of people (cant remember who) are being led by a secret service member who is “in” on the assassination plot and knows that the machine gun guy is there waiting for them, but instead goes first, sacrificing himself. I believe movie is similar to State of Play but am not sure.

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