The atmosphere in the White House on election day is cautiously optimistic, CNN reported, citing sources.
One of the officials also said that Trump "was in a great mood" yesterday and called the American leader an "eternal optimist".
It should be noted that in the United States, with the opening of the polls in New York, New Jersey and Virginia, voting began in the midterm elections for Congress.
In the House of Representatives, voters will elect all 435 members of Congress, and in the Senate, 35 of 100 lawmakers.
Democrats need to increase their representation in the lower house by just four seats from the current 214 to reach the 218-seat mark needed for a majority.
In the upper house, Republicans can lose no more than three seats to retain control of it.