Democrat Hillary Clinton and Republican Donald Trump attacked one another's character as they pushed their closing arguments six days before the U.S. presidential election, while the latest Reuters/Ipsos poll showed Clinton's lead over Trump rising back to the margin she held last week.
Many national polls have shown Clinton's lead over Trump narrowing since the re-emergence Friday of a controversy over her use of a private email while secretary of state.
But the latest Reuters/Ipsos daily tracking poll released on Wednesday showed Clinton's lead over Trump rising back up to 6 percentage points, the same advantage she held before the FBI announcement related to her email practices.
Signs of a tightening race have rattled financial markets as investors started to factor in the possibility that the New York businessman might pull off a victory on Nov. 8.
World stocks, the dollar and oil fell on Wednesday, while safe-haven assets such as gold and the Swiss franc rose. Clinton has been regarded as the candidate who would maintain the status quo, an important factor to financial markets, which generally do not like uncertainty.