Why do I have trouble believing this?

The United States' lead negotiator with Iran, Wendy Sherman, has told Israel's Channel 10 that the US has not offered Iran any sanctions relief. (If you're interested in Iran, don't bother with the video at that link - it doesn't even mention Iran or the sanctions).

"We have not offered any sanctions relief on Iran, and we have not
removed any sanctions," Sherman said in an excerpt of an