New York financier Donald J. Trump’s staff...

New York financier Donald J. Trump’s staff confirmed reports that he had received antitrust clearance last Monday to buy more stock in Caesars World, the Los Angeles-based casino firm. Last month Trump notified federal authorities of his intention to acquire 15% of Caesars’ stock, “subject to price, availability and necessary approvals” and might decide to seek control of the company by acquiring 50% or more. If he acquires 10%, he would have to seek approval of Nevada casino regulators. Caesars’ board Tuesday adopted a so-called poison pill defense against a hostile takeover.