Kerry spoke yesterday before a closed-door meeting of Palestinian donors known as the Ad Hoc Liaison Committee on the sidelines of the UN General Assembly.
The group is focused on helping to revive Palestine's fragile economy while the newly restarted peace talks with Israel move forward.
Kerry also says parties in the talks have agreed to "intensify" them and to "intensify the U.S. Facilitation" of negotiations.
President Barack Obama spoke Tuesday at a meeting with Palestinian Authority President Mahmoud Abbas and plans to meet with Israeli Prime Minister Benjamin Netanyahu next week in Washington.