TRENTON - (AP) - Independent congressional investigators are raising questions about why Gov. Chris Christie scrapped the Hudson River rail tunnel project in 2010.

Christie had said he feared cost overruns when he canceled what was then the largest public works project in the nation.

But a Government Accountability Office report, obtained by The New York Times, finds cost estimates for the tunnel had remained unchanged and state transportation officials had said the project would cost less than Christie had estimated.

The GAO also concluded Christie had misstated New Jersey's share of the costs.

Christie spokesman Michael Drewniak told the newspaper the report failed to consider other expenses associated with the tunnel and the fluctuating estimates suggest no one really knew how much the project would cost. AP: NJ granted extension on tunnel tab Law firm hired to fight Hudson River tunnel tab NJ to challenge feds over $271M tunnel bill Christie sticks with decision to scrap tunnel Gov. Christie takes time to reconsider ARC Tunnel Christie delays decision on tunnel NJ senators rally support in last-ditch effort to save tunnel Study supports new Hudson River rail tunnel Gov. Christie agrees to reconsider NJ-Manhattan rail tunnel Christie scraps plans for rail tunnel between NJ, Manhattan Gov. Christie to review rail tunnel costs Funding for rail tunnel to link NJ, NY up for debate Democratic leaders assail Gov. Christie on tunnel stoppage Amtrak considers new Hudson River tunnel