The top Democrat on the state Senate's investigations committee on Monday said lawmakers have issued information and document requests to the builders of the Tappan Zee Bridge replacement project amid concerns over the construction of the new span. 

The document request, made Friday, comes amid concerns over the construction of the Mario M. Cuomo Bridge crossing the Hudson River, connecting Westchester and Rockland counties.

An Albany Times Union report earlier this year raised concerns with the construction of the bridge and the bolt tightening method used to secure it. State officials at the Thruway Authority have insisted the Mario Cuomo Bridge is safe.

At the same time, the Thruway Authority has been working with Senate investigators over the last several weeks.

"The Senate's Committee on Investigations and Government Operations, in partnership with the Committees on Contracts and Procurement; Corporations, Authorities, and Commissions; and Transportation, issued an information and document request to Tappan Zee Constructors, LLC on Friday, April 23," said Sen. James Skoufis. "Additionally, the Thruway Authority has been cooperative with our inquiry into the Governor Mario M. Cuomo Bridge and has shared significant documentation over the past seven weeks."

The concerns over the bridge have also been rolled into the Assembly impeachment investigation, along with a laundry list of controversies facing Gov. Andrew Cuomo.