The assertion in the question of "Donald Trump announced the US Navy would not be going forward" is not accurate.
While Trump did criticize EMALS program (in an "TIME" interview, not in an official statement), - most likely, after seeing a critical January 2018 Navy report) it has not been stopped. Moreover, in 2018, a successful test of both AAG (Arresting Gear) EMALS (EM Aircraft Launch System) happened:
And officials at General Atomics explicitly stated that the system is on track (being it's a vendor PR statement, take that with an obvious amount of caution):
“We continue to stress the system, analyze results, and tune the system to ensure maximum performance,” stated Dean Key, senior director of EMALS/AAG programs at GA-EMS. "We are on target to be ready for fleet operations when CVN 78 completes its PSA in 2019".
(PSA=Post Shakedown Availability)
A Defense Industry Daily publication from October 2018 sounds a cautious note not offering a conclusion either way:
As the US Navy continues to build its new CVN-21 Gerald R. Ford Class carriers, few technologies are as important to their success as the next-generation EMALS (Electro-MAgnetic Launch System) catapult. The question is whether that technology will be ready in time, in order to avoid either costly delays to the program – or an even more costly redesign of the first ship of class.
Note that even the most pessimistic option listed is merely a redesign of CVN-21, not a cancellation of the whole EMALS approach/project.
Additionally, the Navy has expressed confidence:
“We’re feeling pretty confident on both of those systems, both on catapults and the arresting gear,” said James F. Geurts, assistant secretary of the Navy for research, development and acquisition. (Senate hearing on November 27, 2017).
And rumors are, Trump have possibly changed his opinion of the system after a call with Capt. Pat Hannifin, the commander of USS Ronald Reagan