Secretary of State Rex Tillerson expressed doubt that the U.S. and Russia will reach an agreement on the level of the Kremlin's interference in the 2016 election.

Speaking Sunday during a press conference in Kiev, Ukraine, Tillerson recounted President Trump's meeting Friday with Russian President Vladimir Putin and said the topic of election meddling was raised but he had not expected any concessions from Russia.

"I think, in all candidness, we did not expect an answer other than the one we received, and so I think that, you know, that was about the way we expected the conversation to go," he said.

He said the interference, which four U.S. intelligence agencies have concluded did happen, remains an "obstacle" in improving relations with Russia.

"And so what was announced was, first, we're going to have a dialogue around how do we gain such assurances," he said. "You know, the past – I don't know that we will ever come to an agreement, obviously, with our Russian counterparts on that."

Trump tweeted Sunday morning Putin did deny Russia interfered in the election and "it is time to move forward in working constructively with Russia!"