As the fracas between Elon Musk and President Donald Trump escalated to the point of Musk threatening to decommission SpaceX's Dragon spacecraft, NASA revealed even more delays to Dragon's alternative,

Space science experts told ABC News SpaceX has been essential to NASA’s missions and the breakdown of a relationship would leave a hole that would be hard to fill.

Elon Musk’s threat, which he later retracted, to cut off NASA’s use of SpaceX’s Dragon spacecraft would be a huge blow to NASA, depriving the space agency of the only American vehicle capable of transporting astronauts to the International Space Station and dramatically changing how NASA would access the $100 billion orbiting laboratory.

President Trump on Saturday said that he planned to withdraw his nomination of Jared Isaacman, a billionaire entrepreneur and close associate of Elon Musk’s, to be the next NASA administrator, days before Mr. Isaacman’s expected confirmation to the role by the Senate.

President Trump has pulled his nomination of Jared Isaacman, a billionaire commercial astronaut with close ties to Elon Musk, as NASA administrator.

NASA employees have until July 25 to decide if they'll stay or go. NASA put out a new call urging its workforce to leave the agency this week with a new offer for employment buyouts as the U.S. space program faces huge budget cuts proposed by the Trump administration.