LONDON – Prime Minister Boris Johnson grudgingly asked the European Union on Saturday to delay Brexit after the British Parliament postponed a decision on whether to back his divorce deal. But the defiant Johnson also made clear that he personally opposed delaying the U.K.’s exit, scheduled for Oct. 31. A law passed by Parliament last month set a late-night deadline for the government to send a letter asking the EU for a three-month postponement if lawmakers had not approved an agreement with the bloc by Saturday. An hour before the deadline, European Council President Donald Tusk tweeted: “The extension request has just arrived.