NEW YORK, November 3. /TASS/. The mood at the White House on the day of the US congressional midterm elections is "cautiously optimistic," CNN reported, citing sources.

One official also said US President Donald Trump had been "in great spirits" on Monday, describing him as an "eternal optimist."

The US midterm elections are taking place on November 3. Early voting began in various states several weeks before Election Day. Americans are electing 35 of the 100 senators and all 435 members of the House of Representatives.

Gubernatorial elections will also be held in 36 states. Most states will also hold elections for attorneys general, state legislators and other officials.