(CNN) — The FBI is expected to search former Vice President Mike Pence’s house in Indiana and office in Washington for additional classified materials soon, sources familiar with the matter tell CNN.

Pence’s representatives have been in talks with the Justice Department over the searches and have expressed that they want to completely cooperate.

The Pence team does not believe there are classified documents either at his home or at his office as they have done what they considered an extensive search themselves, a source said.

CNN reported last month that earlier in January, a lawyer for Pence found about a dozen documents marked as classified at the former vice president’s home. The former vice president had directed his lawyer, Matt Morgan, who has experience handling classified material, to conduct the search.

A source who was briefed on some of the Pence documents previously told CNN that the government papers recovered from his home were “lower level” classification, without any “sensitive compartmented information” or “special access programs” markings.

On Wednesday, the FBI completed a search of President Joe Biden’s Rehoboth Beach, Delaware, home and found no documents with classified markings, according to Biden’s personal lawyer.

In the wake of the classified document discoveries at Pence, Biden and former President Donald Trump’s homes, the National Archives formally asked former presidents and vice presidents to re-check their personal records for any classified documents or other presidential records, CNN has reported.

The Wall Street Journal first reported the developments of the planned FBI search.

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