"The US intelligence community knows that the Russian government attacked the US", he said in a statement.
The Russian intelligence officers were charged with hacking the Democratic National Committee and Hillary Clinton's presidential campaign - the latest charges brought in Special Counsel Robert Mueller's investigation into Russia's interference in the 2016 presidential election.
In light of the charges against 12 GRU officers announced by Rod Rosenstein, @realDonaldTrump should cancel his meeting with Putin, who ordered the attack on the US.
Russia's Foreign Ministry is denouncing the United States' indictment of 12 alleged military intelligence agents accused of hacking into Democratic accounts in the 2016 U.S. elections.
"Today's charges include no allegations of knowing involvement by anyone on the [Trump] campaign and no allegations that the alleged hacking affected the election result", White House deputy press secretary Lindsay Walters said.
"President Trump should immediately cancel his meeting with Vladimir Putin", Reed said in a statement. "If President Trump is not prepared to hold Putin accountable, the #HelsinkiSummit should not move forward", McCain said in a series of tweets Friday.
Earlier Friday, Trump said he would question Putin about Russian election meddling when the two meet in Helsinki.
McCain wasn't the only Republican senator to criticize Putin following the indictments.
The charges come as special counsel Robert Mueller investigates potential coordination between Russian Federation and the Trump campaign to influence the presidential election. "We should stand united against Putin's past and planned future attacks against us". "I will absolutely, firmly ask the question and hopefully we'll have a very good relationship with Russian Federation". I don't think. But you never know what happens.
On Friday, several Democratic leaders also weighed in, in some instances urging the president to consider canceling his summit with Putin. After meeting with the Russian leader in November 2017, Trump said of Russia's meddling, "Every time he sees me he says, 'I didn't do that, ' and I really believe that when he tells me that, he means it".
Ruben Gallego of Arizona and eight other Democrats in another letter calling on Trump to cancel the meeting.
Hours before the Justice Department announcement, Trump complained anew that the special counsel's investigation is complicating his efforts to forge a better working relationship with Russian Federation.