Ranking member on the House Armed Services Committee Adam Smith warned Thursday that the country should be "seriously concerned" about what President Trump may say or do during his meeting with Russian President Vladimir Putin.

"He [Trump] is going in to the meeting without having created any kind of strategy to prevent future Russian attacks, and he has reportedly drawn up a list of ‘concessions' to offer the Russian government. We should be seriously concerned about what he is going to do, and what message it will send to the world," Smith, D-Wash., said in a statement.

Smith emphasized that Friday's meeting was arranged "without ever having substantively acknowledged Putin's role in ordering an attack on our democratic values and our system of government."

Trump on Thursday refused to solely blame Russia for interference in the 2016 election.

"I think it was Russia, and it could have been other people in other countries," Trump told a reporter during a press conference in Warsaw, Poland. "A lot of people interfere. It's been happening for a long time."

Trump insisted that "nobody really knows" who tampered in America's election process, which included fake news stories planted on social media in an attempt to sway the public.