Perhaps they're referring to this: https://news.gallup.com/poll/548084/americans-divided-involvement-middle-east.aspx

But I think the phrasing is a bit vague here.

Roughly four in 10 each say the U.S. is doing “about the right amount” (41%) or “not enough” (39%), while about two in 10 (19%) think the U.S. is doing “too much.”

It could be that those 39% think that US should be doing more to hinder Israel.