The national polls have become slightly tighter - Democrat Hillary Clinton leads by a poll average of 5.3 per cent - but the polls in the the swing states which decide the election heavily favour Clinton. She leads by about 10 per cent in Pennsylvania, Virginia, New Hampshire, Wisconsin and Colorado. Clinton is also ahead in the important states of Ohio, Florida and Michigan.
Trump's shifts appear aimed at shoring up support among white GOP moderates who have been reluctant to support extreme positions staked out by Trump during the Republican primary, including a massive US-Mexico border wall, deportation of illegal immigrants and a "total" ban on foreign Muslims.
At the same time, any oscillation carries the risk of alienating Trump's most loyal supporters, many of whom adore his willingness to buck "political correctness" by laying out brash proposals. Trump has thrived in part by staying vague on most of his policy positions, vacillating between extreme rhetoric and assurances of reasonableness. Hillary Clinton's campaign aides and critics of Trump have urged voters to focus on the concrete promises and proposals that Trump has made rather than opaque rhetoric.
One key case in point is Trump's position on foreign-born Muslims. In December, Trump issued a written statement calling for a "total and complete shutdown of Muslims entering the United States," although within days he said it would be temporary and would include a number of exceptions. By the northern spring, he seemed to back away from the controversial proposal, calling it "just a suggestion," only to double down once again following an Isis-inspired mass shooting at an Orlando gay nightclub. Then this northern summer, Trump stopped using the word "Muslim," instead saying he would focus on "areas of the world where there's a proven history of terrorism against the United States" and implement "extreme vetting".
Rick Wilson, a longtime GOP strategist who strongly opposes Trump, called Trump's shape-shifting on such issues "irritating". Wilson said: "He lets people fill in the blanks mentally for what they think he's saying, not what he's actually saying. The people that are fanatics about Trump just say, 'Oh, well, he meant the one that I liked'."