James told MSNBC that she thinks Space Force will have a hard time getting through Congress.
"I think it does have some support in the House of Representatives," James said in an interview on MSNBC, but "I think the Senate will question it very strongly."
At Brookings, James said Pentagon leaders also don't support the idea of adding a Space Force.
“None of them are in favor of a Space Force, I say none of the top leaders, but they’re stuck. The President has said it and it will be interesting to see how they now deal with it,” she said.
Lolita Baldor of the Associated Press reports that Secretary of Defense James Mattis’ opinion on Space Force has changed.
Defense Secretary Jim Mattis has endorsed steps to reorganize the military's space-warfighting forces and create a new command, but he previously opposed launching an expensive new service. A new branch of the military would require layers of bureaucracy, military and civilian leaders, uniforms, equipment and an expansive support structure.
Asked about the cost, Deputy Defense Secretary Patrick Shanahan told reporters the Pentagon doesn't have a number yet but will when the legislative proposal is finished by the end of the year.
In announcing plans to launch Space Force by 2020, Vice President Mike Pence on Thursday called it the “next great chapter” for the military.
“Now the time has come to write the next great chapter in the history of our armed forces, to prepare for the next battlefield where America’s best and bravest will be called to deter and defeat a new generation of threats to our people, to our nation,” Pence said.