Kushner spoke with Ambassador Sergey Kislyak about creating that line of communication to facilitate sensitive discussions aimed at exploring the incoming administration's options with Russia as it was developing its Syria policy, a person familiar with the discussions told The Associated Press.
The intent was to connect Trump's chief national security adviser at the time, Michael Flynn, with Russian military leaders, said this person, who wasn't authorised to publicly discuss private policy deliberations and spoke on condition of anonymity.
The White House did not acknowledge the meeting or Kushner's attendance until March. At the time, a White House official dismissed it as a brief courtesy meeting.
Back from a nine-day trip to the Middle East and Europe, Trump today immediately sought to dismiss recent news reports as "fake news."
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"It is my opinion that many of the leaks coming out of the White House are fabricated lies," he tweeted. He added: "Whenever you see the words 'sources say' in the fake news media, and they don't mention names ... It is very possible that those sources don't exist but are made up by fake news writers."
The Post reported that Kislyak was taken aback by the suggestion of allowing an American to use Russian communications gear at its embassy or consulate a proposal that would have carried security risks for Moscow as well as the Trump team.
According to the person familiar with the Kushner meeting, the Trump team eventually felt there was no need for a back channel once Rex Tillerson was confirmed as secretary of state, which took place February 1. The team decided to communicate with Moscow through more official channels.
Sally Yates, the former acting attorney general, told Congress this month that that deception left Flynn vulnerable to being blackmailed by the Russians. Flynn remains under federal investigation in Virginia over his foreign business ties. He was interviewed by the FBI in January about his contacts with Kislyak.
The disclosure of the back channel put White House advisers on the defensive yesterday, as Trump wrapped up his first foreign trip as president. Lawyers for Kushner said he was willing to talk with federal and congressional investigators about his foreign contacts and his work on the Trump campaign.
Speaking generally, national security adviser HR McMaster said "we have back channel communications with a number of countries." He added: "It allows you to communicate in a discreet manner."
Kushner was a trusted Trump adviser last year, overseeing the campaign's digital strategy. He remains an influential confidant within the White House as does his wife, Ivanka Trump.
Investigators are also interested in a meeting Kushner had with the Russian banker, Sergey Gorkov, according to reports from the Post and NBC News.
Federal investigators and several congressional committees are looking into any connections between Russia and the Trump campaign, including allegations that there may have been collaboration to help Trump and harm his Democratic opponent, Hillary Clinton.