US presidential candidate Donald Trump plans to hold a rally on Saturday in Butler, Pennsylvania, where an assassination attempt on his life occurred in July. Trump’s campaign is positioning the event as a tribute to the American spirit, reports the Associated Press. “I’ll probably start with the words: “As I was saying……'” Trump joked, referencing the abrupt end of the July rally in Butler when gunshots rang out, prompting security to escort him off the stage. Trump’s campaign predicts that tens of thousands of people will attend the event. Local hotels and motels are reportedly already ful…