Former US President Jimmy Carter said Monday that it's a "problem" that Israel and the US refuse to meet with Hamas. He also said Israeli-Palestinian peacemaking has "regressed" since the US-hosted Mideast conference in Annapolis, Maryland, in November. Carters' comments come after he met with top Hamas leaders in Syria last week. "The problem is not that I met with Hamas in Syria. The problem is that Israel and the United States refuse to meet with someone who must be involved," said Carter, speaking in Jerusalem.