WASHINGTON — Attorneys for former Trump campaign chairman Paul Manafort are arguing that the special counsel leading the Russia investigation is hiding what led agents to search a storage unit in connection with Manafort's ongoing criminal case.

A new court filing reveals that special counsel Robert Mueller's prosecutors redacted a page and a half of information related to the search in documents they produced to Manafort.

Manafort attorneys Kevin Downing and Thomas Zehnle say the move is blocking their ability to determine whether the search was proper.

They are asking a judge to force the special counsel to turn over complete copies of all search warrants. The filing does not disclose the storage unit's contents.

Manafort faces numerous charges alleging financial crimes and that he acted as an unregistered foreign agent.