"As of today, we do not have any activity that we’re attributing on the election infrastructure to a foreign entity," Nielsen said during an event at the Council on Foreign Relations.
US officials previously expressed concerns over possible "Russian interference" during the midterm elections in the country. The Department of Justice stated in October that Russian national Elena Khusyaynova had been charged with alleged interference in US elections, including the upcoming midterms.
According to the department, she had helped to fund fake social media posts in order to influence American voters.
The US midterms are scheduled to be held on November 6. US voters will elect all 435 members of the House of Representatives and around a third of all US senators as well as local authorities in many states.