Opinion: How Trump Should Restart U.S. Space Momentum, Scott Pace, Aviation Week
"And the Obama administration continued to push away partners, telling Europe to go to the Russians for its next robotic science mission. Plans for human missions to Martian orbit and a distant asteroid failed to find international partners. Mars in the 2030s is not a practical basis for managing a global space enterprise, and our partners are making separate plans. It is increasingly hard to hold the International Space Station partnership together when no one knows that is supposed to come next."