(Washington, DC) -- The Trump-Putin summit is facing bipartisan criticism in Congress. South Carolina Republican Senator Lindsey Graham tweeted that Trump missed an opportunity to hold Russia accountable for meddling in the 2016 presidential election. Graham also said Trump should have given Putin a strong warning to stay out of future U.S. elections. Virginia Democratic Senator Mark Warner stressed that Russia "massively intervened" in the presidential election. He said it's clear that Russia's aim was to help Donald Trump and hurt Hillary Clinton.