On Friday, US presidential candidate Kamala Harris once again questioned the fitness of her opponent Donald Trump for the White House. This occurred following a series of canceled campaign events, according to Axios. The publication reports that the Vice President raised concerns about the Republican candidate’s fitness for the presidency during her campaign in Michigan on October 18. “I’ve been hearing reports that his team, at least, is saying he’s suffering from exhaustion. Being president of the United States is probably one of the hardest jobs in the world. And so we really do need to ask…