- I've seen what you do to friends.
- What's that supposed to mean?
- You slit your friend's throat.

10 seconds sound clip from the In the Line of Fire movie soundboard.

You can hear this line at 01:17:39 in the Blu-ray version of the movie.

Quote context

[...]

- Let me take a second to give a hearty welcome to all of you joining our program in progress.

- I know who you are, Leary.

- I'm glad, Frank.

- Friends should be able to call each other by name.

- We're not friends.

- Sure we are.

- I've seen what you do to friends.

- What's that supposed to mean?

- You slit your friend's throat.

- You talked to Coppinger?

- Yeah, that's right.

- Did you delouse? The man's a professional liar.

- I saw the photos.

- No, you saw what he wanted you to see.

[...]