He told this to reporters.
"We drew a red line and made it clear to China, Russia, Iran and others that anyone who tries to interfere in the elections will face extraordinary consequences," Trump's advisor was quoted as saying by RIA Novosti.
In April, Russian Foreign Minister Sergei Lavrov said that Moscow "foresees and already senses" a new wave of accusations of "interference" in the American elections.
The Kremlin noted that Russia has never interfered in electoral processes in any country in the world.