President Barack Obama says the storm powering towards the US East Coast is "serious and big" and will be "slow moving."
As for the potential impact on voting, Mr Obama says that "we don't anticipate that at this point but we're obviously going to have a look".
Some states have begun early voting ahead of the November 6 presidential election.
The president made the comments during a visit to the headquarters of the Federal Emergency Management Agency (Fema) to get an update on plans for responding to Hurricane Sandy.
The National Response Co-ordination Centre in Washington is where Fema is managing the deployment of federal resources and teams to states along the East Coast ahead of the storm.
The president is expected to head to Florida, where he is campaigning on Monday.