(CNN) Former White House chief strategist Steve Bannon won't appear before the House Intelligence Committee Tuesday, escalating a tense standoff with the panel.

Bannon was not planning on showing up ahead of a Tuesday deadline because the White House and committee haven't reached an agreement over the scope of the questioning, a source said Monday.

The House Intelligence Committee confirmed Tuesday it was giving Bannon another week to comply with its subpoena.

"The House Intelligence Committee's interview with Stephen Bannon has been postponed at the Committee's initiative until next week," Emily Hytha, spokeswoman for Rep. Mike Conaway, the Republican running the committee's Russia probe, said in a statement. "We look forward to having him before the Committee once we can assure that he will be able to thoroughly answer all our questions without concerns regarding the scope of executive privilege."

The committee's top Democrat released a statement calling Bannon's failure to testify "unacceptable."

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