The senate must approve the treaty with Israel in order to build missile bases in Israel.
In the United States of America's constitution, the senate has the sole power to approve whatever treaty that the president or the executive branch of government negotiates. This approval is done by a two-third vote.
From this explanation above, if the President is to have a treaty that exchanges loans for the Americans to have their missile base in Israel, the Senate would have to be the ones to approve the treaty.
