The tweet came hours after the president tweeted congratulations to World Cup winners, France, and President Putin saying: "one of the best ever!"
RELATED: Trump condemns Russia probe after Putin talks
Trump met with Putin Monday morning for a summit in Helsinki, Finland.
It is their first meeting since the 2016 presidential election and comes days after the US Justice Department announced 12 Russian military officials had been indicted for an attack on Democrats' emails during the 2016 campaign.