Any chance of the Republican Party regaining the White House has been hampered by Donald Trump's campaign tactics, according to one U.S. policy expert.
The latest and final poll from NBC and the Wall Street Journal shows Clinton holding a slim lead over Trump, with a four-way race showing her on 44 percent to Trump's 40 percent.
James Boys, senior US policy expert and associate professor of international political studies at Richmond University, told CNBC Monday that Trump is not waging a campaign that can win the election.
"If you put in someone who could reach out to Hispanics, to women, to the African American community and build on what Mitt Romney had done four years ago, maybe.
"But when you see him do the exact opposite, it is impossible to see how he can win this," he said.