Both campaigns are trying to score points with Jewish voters back home and have worked to tout their stances on Israel.
The bill Obama signed, which reaffirms U.S. strategic and military ties with Israel, cleared Congress 10 days ago, giving the president ample time to sign it. Instead he chose the eve of Romney's highly anticipated trip.
Romney, for his part, gave interviews to the Israeli press ahead of his trip vowing to “take whatever action is necessary” to prevent Iran from gaining a nuclear weapon.
Read more on The Hill's Global Affairs blog.