(CNN) President Donald Trump's former fixer Michael Cohen spent several hours Thursday inside the Senate Intelligence Committee's secure spaces ahead of his closed-door testimony scheduled before the panel next week.

Cohen was on Capitol Hill on Thursday in the Senate Intelligence Committee's secure spaces ahead of next week's interview. He spent most of the day there, with a break for lunch at the Monocle, a restaurant near the Capitol. He left shortly before 5 p.m. ET and declined to answer any questions on his way out.

Cohen is scheduled to be interviewed by the Senate Intelligence Committee behind closed doors on Tuesday, according to a source familiar with the matter, the first of three congressional appearances next week for the President's former lawyer.

Cohen is slated to testify publicly on Wednesday before the House Oversight Committee and behind closed doors again Thursday before the House Intelligence Committee.

It's not clear why Cohen was in the Senate Intelligence Committee's office ahead of his testimony, an unusual step for witnesses who have been interviewed by the panel as part of its two-year Russia investigation.

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