The U.S. is going to "watch and see" how Israel is implementing changes requested by President Joe Biden to limit humanitarian suffering in Gaza, White House spokesman John Kirby said Friday. In a tense call on Thursday, President Biden issued a stark warning to Prime Minister Benjamin Netanyahu the U.S. would reconsider its policy approach if Israel didn't take concrete steps to better protect civilians and aid workers after Israeli strikes killed seven food relief workers with the World Central Kitchen.