(CNN)President Donald Trump, House Speaker Paul Ryan and Senate Majority Leader Mitch McConnell each took an oath of office that included solemnly swearing to defend the Constitution of the United States.

It's long past time for Trump, Ryan and McConnell to stop ignoring the oaths they swore and to start protecting the country against the open attack by Vladimir Putin and his cronies on our constitutional system of government.

There can no longer be any doubt about the nature of that assault and the identity of the assailants, nor about future assaults. On February 13, the nation's intelligence chiefs, in testimony before the Senate, all agreed that Russia is planning to intervene in the 2018 midterm congressional elections. Director of National Intelligence Daniel Coats, a former Republican US senator, testified there should be no doubt that Russia views its efforts to meddle in the 2016 presidential campaign as successful.

An indictment obtained on February 16 by special counsel Robert Mueller against three Russian entities and 13 Russian individuals documented that Russia engaged in illegal "information warfare" against our country. After the indictment, President Trump's national security adviser H.R. McMaster said at an international security conference that the evidence Russia acted to influence the 2016 US election is "now incontrovertible," and he is right.