President Bush yesterday vowed to use his first-ever veto to strike any law that Congress passes to block a deal allowing an Arab state-owned company to operate six major U.S. seaports, amid growing bipartisan efforts to thwart the plan for security reasons. "If there was any chance that this transaction would jeopardize the security of the United States, it would not go forward," the president said in a brief but firm statement on the White House South Lawn. Mr. Bush said questioning the deal because it involves United Arab Emirates company makes no sense, given that a British company now...