Fai, 62, arrested by the FBI on Tuesday made donations to Congressmen and presidential candidates and organised conferences and seminars to reflect the viewpoint of Pakistan on Kashmir.
A spokesman of the Department of Justice said that Fai has been scheduled to appear before the judge Theresa Carroll Buchanan at the US District Court in Alexandria, Virginia.
Fai, was initially produced before the court on Tuesday a few hours after his arrest.
According to court officials, Fai has not intimated who his attorney would be, but was hopeful that he would be able to have one by tomorrow.
The FBI in its affidavit before the US court alleged that Kashmir-born US national received hundreds and thousands of dollars from the ISI and the Government of Pakistan with the sole objective of molding the view of American policy makers on Kashmir.