by Andrew BEATTY WASHINGTON, United States (AFP) — In a searing and virtually unprecedented presidential rebuke, Barack Obama declared embattled Republican White House nominee Donald Trump “unfit” to be president Tuesday and called on party leaders to disown him. Obama piled on as Trump’s campaign reeled from multiple self-inflicted scandals, calling the 70-year-old mogul “woefully unprepared” and “unfit to serve as president.” “He keeps proving it,” said Obama, standing alongside the prime minister of Singapore […]