Uzi Arad, who is expected to serve as national security adviser in the next Israeli government, has been barred from entering the United States for nearly two years on the grounds that he is an intelligence risk.

Mr. Arad, a former member and director of intelligence for the Mossad, Israel's spy service, is mentioned in the indictment of Lawrence Franklin, a former Pentagon analyst who pleaded guilty in 2005 to providing classified information about Iran in a conversation with two employees of the American Israel Public Affairs Committee (AIPAC).

Beyond Mr. Arad's status, Prime Minister-designate Benjamin Netanyahu is likely to face difficulties abroad because of his choice, announced Monday, of Avigdor Lieberman to serve as foreign minister in a narrow new rightist government. Mr. Lieberman, head of the Israel Is Our Home party, has advocated requiring Israel's 1.46 million Arabs to take a loyalty test or risk expulsion.

The choice of Mr. …