On January 24, 2017, President Trump signed Executive Order 13766, establishing a streamlined framework for federal environmental review of infrastructure projects designated as high priority by the administration. The order directed federal agencies to complete environmental assessments within a compressed two-year timeline rather than the standard review period, which often extends five to seven years. This mechanism granted the President unilateral authority to designate which projects qualified for expedited review, effectively centralizing decision-making power over infrastructure permitting while reducing the scope and duration of environmental scrutiny.

The order directly affected infrastructure project developers, permitting agencies including the Army Corps of Engineers and the Department of Transportation, and communities situated along proposed pipeline, highway, and energy infrastructure routes. Environmental review processes—designed to identify potential impacts on water supplies, air quality, wildlife habitat, and public health—became compressed under artificial timelines. Applicants for major projects gained material advantage through shortened decision windows, while agencies faced pressure to complete comprehensive assessments within arbitrarily reduced periods.

This action established the template for Trump administration environmental deregulation that would accelerate dramatically throughout 2026. The Defense Production Act invocation for fossil fuel infrastructure, mining operations authorized in Minnesota's Boundary Waters region, and the systematic dismantling of EPA scientific capacity all represent direct extensions of this initial executive order. Each subsequent action compounded the weakening of environmental review mechanisms first introduced through EO 13766, progressively eroding agency capacity to evaluate cumulative ecological impacts.

The executive order faced immediate legal challenges from environmental organizations and several states, though courts have allowed portions to remain in effect pending litigation. The compressed timeline framework survived initial constitutional scrutiny, establishing precedent that presidents possess authority to modify administrative review procedures through executive order without congressional approval.

Reversing this action would require either presidential directive rescinding EO 13766 or congressional legislation restoring standard environmental review timelines and limiting executive designation authority over project prioritization.