The top Democrat on the U.S. House Intelligence Committee described on Wednesday "a developing pattern" in which witnesses have declined to discuss events occurring after President Donald Trump's election in the panel's probe of Russian Federation and the 2016 vote. "Should Bannon maintain his refusal to return and testify fully to all questions, the Committee should begin contempt proceedings to compel his testimony".
Schiff said that neither Bannon nor Lewandowski had given "legitimate" reasons for refusing to appear, and that they were expected to return.
Contempt of Congress is a federal misdemeanor, punishable by a maximum $100,000 fine and up to one year in federal prison.
The House intelligence committee is giving former White House chief strategist Steve Bannon another week to negotiate the terms of a closed-door interview.
Says Schiff: "Mr. President, I see you've had a busy morning of 'Executive Time.' Instead of tweeting false smears, the American people would appreciate it if you turned off the TV and helped solve the funding crisis, protected Dreamers or.really anything else".
Escalating a tense standoff with the panel, Bannon isn't planning on showing up because the White House and committee haven't reached an agreement over the scope of the questioning, the source said.
The committee has chose to postpone his interview until next week to allow time for the committe and the White House to agree on the terms of the interview.
The source said Bannon would answer all of Mueller's questions when he appears before him, which is expected next week.
Adam Schiff said Bannon's lawyer told the committee he is barred from talking about matters during the presidential transition, his time at the White House and communications with President Donald Trump since he left in August.
Conway's office said the committee itself - which is investigating Russian interference in the 2016 election - had made a decision to delay the interview with Bannon. Specifically, the memo takes aim at the FBI's use of information from former British spy Christopher Steele, who compiled a dossier containing allegations of ties between Trump, his associates and Russian Federation.
Moscow has denied meddling in the US presidential election, and Trump denied any collusion between his associates and Moscow. Members of the committee have said privilege would not apply.