[5] This directive amended Barack Obama's "Presidential Policy Directive 4," by replacing the paragraph beginning “Set far-reaching exploration milestones...”[6] with the paragraph “Lead an innovative and sustainable program of exploration with commercial and international partners to enable human expansion across the Solar System and to bring back to Earth new knowledge and opportunities.
Beginning with missions beyond low-Earth orbit, the United States will lead the return of humans to the Moon for long-term exploration and utilization, followed by human missions to Mars and other destinations.” On May 24, 2018, Donald Trump issued Space Policy Directive-2,[7] "Streamlining Regulations on Commercial Use of Space," which begins "Section 1.
It is the policy of the executive branch to be prudent and responsible when spending taxpayer funds, and to recognize how government actions, including Federal regulations, affect private resources.
It is therefore important that regulations adopted and enforced by the executive branch promote economic growth; minimize uncertainty for taxpayers, investors, and private industry; protect national security, public-safety, and foreign policy interests; and encourage American leadership in space commerce."
Preserving the space environment for safe operations is in every nation's best interests, so the policy leads in the direction of cooperation on collision avoidance, orbital debris mitigation, etc.