Donald Trump is promising expedited federal permits for energy projects and other construction worth more than $1 billion. But like other Trump plans, the idea is likely to run into regulatory and legislative hurdles, including a landmark law that requires federal agencies to consider the environmental impact before deciding on major projects.

While Trump did not specify who would be eligible for accelerated approvals, dozens of energy projects proposed nationwide, from natural gas pipelines and export terminals to solar farms and offshore wind turbines, meet the billion-dollar criteria

Environmental groups slammed the proposal, calling it illegal on its face and a clear violation of the National Environmental Policy Act, a 54-year-old law that requires federal agencies to study the potential environmental impact of proposed actions and consider alternatives.