text:  From ABC News, I'm Chuck Severson. What about that Gaza ceasefire deal that Israel supports and has been on the table for the militant group Hamas for weeks? The U.S. is trying to offer Hamas a chance to change the deal, says ABC's Matt Gutmann in Tel Aviv. The U.S. is trying to offer Hamas a chance to amend the current deal. Hamas saying that this is nothing new. They're saying that they will only agree to a guaranteed ceasefire and a full withdrawal of Israeli troops from the Gaza Strip,