I cannot removed the faucet handle line under the sink that has black plastic and a white clip running through it. There is a brass nut just above it and it is loose. It is the last piece I need in order to remove it.

If I understand you correctly...

You should just need to pry that clip back out of the black casing...

It looks like the clip ends are broken off. There is nothing to grasp to pinch together.

There is just barely enough, but push each side in one at a time and see if that halps to push each side of the clip back out. Otherwise, can also BREAK the clip off if not planning to use the faucet again. Just wiggle back and forth and snap the clip off OR snap the brass that it clips to off.

Let me know how you do.

MARK