U.S. coordination with Israel on Iran policy is intensifying as the Obama administration’s top military adviser prepares for his first trip to Tel Aviv since taking office in September.

President Barack Obama spoke to Israeli Prime Minister Benjamin Netanyahu by phone on Jan. 12 about Iran and reaffirmed the “unshakable” U.S. commitment to Israel’s security, according to a White House statement.

Rising tensions over Iran’s nuclear program has the Obama administration balancing how to dissuade Israel from military action against Iran without fueling doubts about its support for a politically important ally. Defense Secretary Leon Panetta said last week that continued pressure, not talk of air strikes, is the best way to forestall Iran’s nuclear program.