WASHINGTON — President Barack Obama and his Republican opponents are clashing over U.S. policy toward Israel as each side jockeys for support from Jewish voters, who could be critical in the 2012 election.

Aiming to cast Obama as unfairly harsh toward Israel and soft on the Palestinians, Republican presidential hopefuls Mitt Romney and Newt Gingrich have called on the president to fire his ambassador to Belgium. The envoy, Howard Gutman, had said that some anti-Semitism stemmed from tensions between Israel and the Palestinians; Romney and Gingrich say his remarks unfairly blamed Israel.