( 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 members of the panel next week.

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.