Democrat Hillary Clinton and Republican Donald Trump headed to North Carolina on Thursday in a final effort to shore up support in the swing state as polls showed Clinton maintained her lead nationally just days ahead of the Nov. 8 presidential election.

Clinton was leading Trump by 6 percentage points, a Reuters/Ipsos poll found on Wednesday.

Two new polls released on Thursday, by the New York Times/CBS and the Washington Post/ABC, showed her with a slimmer lead: in line with a drop in her advantage since the re-emergence last week of a controversy over Clinton's use of a private email server while secretary of state.