(Rick Bowmer | AP file photo) In this July 18, 2018, file photo, a wild horse jumps among others on Bureau of Land Management land near Salt Lake City. Congressional Democrats are demanding the Interior Department produce an overdue report on plans to manage wild horses roaming federal lands in the West after the head of its public lands agency told reporters it will take $5 billion and 15 years to get overpopulated herds under control.