If the Trump administration’s picks for space-policy advisers are an indication, the country will remain on a long-term mission to Mars. Wrenching the idea of a Martian journey from the American public after two terms of successful NASA public-relations campaigns and Hollywood space movies would be a difficult exercise. Plus, there’s strong bipartisan agreement in Congress that the Mars deadline can’t move. But the next four to eight years may see an aggressive push for more movements in Earth’s backyard, where hundreds of satellites and the International Space Station reside.

Politico reports Trump advisers want “private American astronauts, on private space ships, circling the Moon by 2020.” That vision puts a lot of faith into private spaceflight companies that are developing and testing rockets capable of carrying payloads and people to low-Earth orbit. The company SpaceX especially stands to benefit from this ambition, because its CEO, Elon Musk, meets often with Trump as a member of the president’s advisory council of business leaders.

Increased investment in private-public partnerships in human spaceflight would actually be an expansion of Obama’s hopes for NASA. But spaceflight is blind to the origins of funding, both private and federal. SpaceX and Boeing are already behind schedule on perfecting the rockets they’ll let NASA use to carry astronauts into space next year. SpaceX has seen two rockets blow up in less than two years. The funding isn’t there yet, either; Trump has not announced a budget proposal for the next fiscal year, a process that usually begins in February.

“This is not a bad idea, but the timeline that’s implied in this article would be an unprecedented speed,” Casey Dreier, the director of space policy at the Planetary Society in California, said of the Trump advisers’ ambitions. “Just because you have private companies involved doesn’t mean you can ignore physics or the harsh environment of space.”

The president’s advisers favor these private spaceflight companies, considered “New Space,” over “Old Space” contractors, like Boeing and Lockheed Martin. “We have to be seen giving ‘Old Space’ a fair and balanced shot at proving they are better and cheaper than commercial,” the documents say. This likely won’t sit well with Congress. In 2010, Congress instructed NASA to develop a heavy, expendable launch vehicle that would replace the shuttle program and carry transport astronauts into orbit. The Space Launch System, or SLS, is being manufactured by Boeing and Lockheed Martin, with plans for a first flight in late 2018.

The SLS is costing billions of dollars, far more than the rocket technology being developed by private companies, but it employs tens of thousands of people. Lawmakers, Dreier says, won’t be jumping the idea of killing jobs in their districts in favor of sending humans to the moons with rockets made somewhere else. The closer the Trump administration gets to the private spaceflight company, the greater the risk of alienating some of his Republican allies in Congress.