The US presidential race is much closer than national surveys suggest, according to Reuters/Ipsos opinion polls in battleground states that show Democrat Joe Biden with only a slim lead over President Donald Trump in three highly competitive states and in a dead heat in three others.

The online state polls, conducted earlier in September and released this week, found Biden and Trump tied among likely voters in Florida and North Carolina. Biden led by 1 percentage point in Arizona, 3 points in Pennsylvania and 5 points in Wisconsin and Michigan.