SoftBank has agreed to give the U.S. government the right to approve one of the directors it names to Sprint’s board, the Wall Street Journal reports. Dish Network, SoftBank’s rival bidder for Sprint, has meanwhile launched an advertising campaign and a website to argue that “the sale of wireless and wireline infrastructure with national strategic importance to a foreign company will weaken the security of the United States” SoftBank said in October last year that it had reached a deal to acquire a 70 percent stake in Sprint for US$20 billion.”]