The Woodrow Wilson Presidential Library is buying a building to house its expanding collection of Wilson papers.

Executive Director Eric Vettel says the building is next to the museum and will serve as an archive. About $2 million in private money is being used to acquire and renovate the building.

Vettel says the library's collection has grown from 10,000 to 1 million papers in the past two years, and there's an opportunity to acquire another 1 million papers. But Vettel says the new documents can't be acquired until the archive is ready.

Funding is needed to preserve and maintain the papers. Library officials hope the U.S. Senate will approve a bill that would authorize up to $5 million for organizations that preserve presidential papers. The measure already has passed the House.