Congressional Democrats are demanding to hear directly from Kushner over allegations of the proposed secret back-channel.
Also on our docket this week, the future of US involvement in the Paris Accord, reviewing the Congressional Budget Office's scoring of Republicans plan to repeal and replace the Affordable Care Act and a look ahead to whether Republicans will run to or from President Trump in the 2018 midterm elections. Trump officials were preparing to establish a "war room" to address the issue that has begun to dominate his young presidency. Just back from visiting the Middle East and Europe, Trump on Sunday dismissed recent reports as "fake news".
Questions continue about allegations that his campaign and associates had contacts with Russian officials before he entered the White House.
The administration had hoped Trump's nine-day turn in the worldwide spotlight would offer a respite from relentless coverage - marked by an endless barrage of explosive revelations - of an ever-widening probe into Russian meddling in last year's election and possible collusion by the Trump campaign.
Democrats have called for Donald Trump's son-in-law Jared Kushner to have his White House security clearance suspended after it emerged the Federal Bureau of Investigation was looking into meetings he held with Russian officials.
Kelly, the homeland security secretary, carried the same message on Sunday.
"It's both normal in my opinion and acceptable", he told ABC News on Sunday.
"Any way that you can communicate with people, particularly organisations that are maybe not particularly friendly to us, is a good thing".
The Trump White House is frustrated with the Russian Federation election meddling investigation - and the president himself has complained to friends he doesn't have a coordinated response to the seemingly daily disclosures.
"You've got the ambassador to Russian Federation reporting back to Moscow on an open channel", Graham said.
Mr Schiff was particularly concerned about a Washington Post report that the back channel would have been conducted at a Russian diplomatic facility to avoid monitoring in U.S. communications systems.
"You have to ask, well, who are they hiding the conversations from?"
He initially failed to report these meetings on his security clearance forms, according to The New York Times, although his lawyer claimed this was an accident and said the forms would be changed. "Kushner's security clearance should be suspended until the FBI's findings are complete".
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 for as the Trump team.
Schiff said he "fully" expects that the committee will want Kushner. I mean, this becomes more and more freaky. "They reached out to us yesterday to make sure that we knew that was the case", Corker told NBC's "Meet The Press".
His whirlwind foreign trip over, President Donald Trump is facing old and new political and policy challenges at home. They're staying put but have previously told friends they will continue to evaluate and reassess whether they plan to stay in Washington. "They are in to do us in".