SAN DIEGO, California: US presidential hopeful Hillary Clinton tore into her likely election rival Donald Trump as never before on Thursday (Friday in Manila), saying his foreign policy is dangerously incoherent and labeling him unfit for office. “He is temperamentally unfit to hold an office that requires knowledge, stability and immense responsibility,” Clinton said, cranking up the rhetoric in what is already a deeply acrimonious election season. “This is not someone who should ever have the nuclear codes.” Americans will go to the polls on Nov. 8 to elect a new president, replacing Barack Obama who steps down after eight years in office. Clinton and Trump are all but assured to be the Democratic and Republican party nominees. Clinton, who formerly served as secretary of state, first lady and US senator, is vying to become the first female president in America’s 239-year history.