Now is not the time to talk about a ceasefire. We must support Israel in efforts to eliminate the Hamas terrorists who slaughtered innocent men, women, and children. … We can talk about a ceasefire after Hamas is neutralized.

https://slate.com/news-and-politics/2023/10/john-fetterman-israel-position-explained.html

So basically, Fetterman believes that Israel can keep killing thousands of children as long as Hamas continues to exist.