Still on Trumps other developments:

• Ivanka Trump cut short an interview with Cosmopolitan after objecting to the questions
• Mr Trump's son, Donald Trump, Jr, denied anti-Semitism after he accused the media of not holding Democrats to account, adding: "If Republicans were doing that, they'd be warming up the gas chamber right now"
• He also said his father had declined to release his tax returns because they would only distract from his main message, according to the Pittsburgh Tribune-Review
• Republican House Speaker Paul Ryan said Mr Trump should release his tax returns, but would leave the timing of it up to him

The polls indicate a tight race nationally and in the key battleground states, with 54 days to election day.