The national intelligence chief learned of the invitation while being interviewed onstage at a security conference.
U.S. negotiators have faced stiff resistance from their North Korean counterparts despite the president’s declaration that the crisis had been “largely solved.”
Moscow says it has already sent formal proposals to Washington based on “agreements” between Trump and Putin.
The effort is designed to foil covert operations such as the one Russia undertook in 2016 to disrupt the presidential election.
The U.S. citizens wanted for questioning by a Russian prosecutor all played a role in a 2012 law that imposed sanctions on Russians in Putin’s inner circle.
Some officials said they have considered resigning but stay in the administration to “hold the line.”
The lack of clarity about the meeting has created confusion across the U.S. government.
The Trump administration has offered few specifics on meetings that the president describes as a “tremendous success.”
The move by NSA Director Paul Nakasone comes as Trump again dismisses findings of Russian culpability.
The confusion underscores the effect of the president’s on-the-fly style and his affinity for a nation that officials describe as a major threat.
“It's disturbing you have to file a lawsuit to get the Army to follow its own regulations,” a retired Army officer and immigration lawyer said.
The U.S. president says Putin was “extremely strong and powerful in his denial” of Russian interference in the 2016 election.
With the battlefield stalemated, U.S. officials look to jump start a stalled peace process.
While the president courts Putin and attacks allies, the defense secretary often seems to be inhabiting a different world.
The documents show some startling historic capabilities but provide no proof of cheating on the 2015 nuclear deal.