I can't do that.
3 seconds sound clip from the Casino (1995) movie soundboard.
You can hear this line at 01:22:45 in the Blu-ray version of the movie.
Quote context
[...]
- He's weak. He's incompetent. He jeopardizes the whole place.
- There's not much more I can do for him.
- Old Don is as useless as tits on a boar.
- Well, could there be any position farther down the trough?
- I'm sorry. I can't do anything.
- He's too incompetent, and the bottom line is, he cannot be trusted.
[...]