No idea on the truth regarding this so the usual caveats apply.
"Pres. Donald Trump has weighed in on the future configuration of the U.S. Navy’s aircraft carrier fleet.
Trump is insisting that the service return to installing steam catapults in place of the state-of-the-art Electromagnetic Aircraft Launch System, or EMALS, that was developed for the Gerald R. Ford–class super carriers.
The president is explicit in his directive—all future U.S. Navy carriers will revert to steam catapults. ..."
Trump Said All Future U.S. Navy Carriers Will Use ?Goddamned Steam? Catapults | War Is Boring