Federal investigators found hundreds of videos depicting underage boys engaging in sexually explicit conduct on a computer hard drive recovered from the home of the former chief of staff to Sen. Lamar Alexander, a Tennessee Republican, according to court documents filed Thursday.

Jesse Ryan Loskarn, 35, was arrested this week on charges of possessing and distributing child pornography and will remain in custody in advance of a detention hearing scheduled for Monday, a judge ruled.

According to a criminal complaint filed Thursday, Loskarn purchased several videos between November 2010 and March 2011 from a movie production company that was under investigation by the U.S. Postal Inspection Service and the Toronto Police Service.