The space agency has published its budget request to Congress which would see funding for science projects cut by nearly a half.

The U.S. government relies on SpaceX to support NASA and other agencies, and the company has received more than $20 billion in federal contracts for it. As Musk and Trump threaten to cut ties, here’s what that would mean for the U.

The worried reaction within space and national security agencies highlights the risks of government’s exclusive dependence on SpaceX for crucial tasks, including classified missions.