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By Doina Chiacu WASHINGTON (Reuters) - Republican presidential candidate Donald Trump increased his attacks on a former beauty queen with a vague and unsubstantiated allegation about a sex tape in predawn Twitter posts on Friday, and Democratic rival Hillary Clinton denounced him as "unhinged." Trump's refusal to drop his invective against Alicia Machado, the Miss Universe from Venezuela whom he criticized for gaining weight after she won the crown in 1996, threatened to damage his already weak standing among women and Hispanics. With less than six weeks to go until the Nov. 8 election, Trump made reference - without giving evidence - to a sex tape involving Machado, who had publicly denounced him all week as a humiliating bully. "Did Crooked Hillary help disgusting (check out sex tape and past) Alicia M become a U.S. citizen so she could use her in the debate?" Trump said in his Twitter messages in the early hours of Friday.
US captain Davis Love has no problem with a 5-3 lead over Europe after Friday's opening Ryder Cup matches, even though that margin has heralded doom for the Americans twice before. The United States swept foursomes matches for a 4-0 lead, its best start since 1975, but Europe's 3-1 fightback in four-ball left the Americans clinging to a familiar lead entering Saturday's identical format. The first time was in 1995, when a last-day rally brought Europe a 14 1/2 - 13 1/2 win.