Manheim, Pennsylvania (CNN) Donald Trump on Saturday evening offered up the surest sign yet that he is returning to the bombastic, bare-knuckle style that defined his primary run as he wrapped up a week that raised fresh concerns about his presidential campaign's viability. Straying from the prepared remarks on his teleprompter, the Republican nominee reignited his attacks on Hillary Clinton's physical and mental health, arguing that the former secretary of state "could be crazy" and lacks the "stamina" to be president -- even imitating Clinton stumbling into her car while leaving a 9/11 ceremony last month. And just as he is once again drawing attention to former President Bill Clinton's sex scandals, Trump took his political attacks a step further, questioning, with no evidence, whether the Democratic nominee is "loyal" to her husband. The attacks came as The New York Times raised fresh questions about his payment of taxes and business success.Trump's personally charged rhetoric comes as he continues to defend his debate performanceGOP nominee also hit Clinton over her newly surfaced comments about Bernie Sanders' supporters
_'s doctor revealed later that day that Clinton had just been diagnosed with pneumonia and "overheated" at the ceremony. Clinton's doctor revealed later that day that _ had just been diagnosed with pneumonia and "overheated" at the ceremony.