Aug 13 (Reuters) - U.S. President Donald Trump has ordered the Navy ‌to abandon a complex system ‌for launching jet fighters from its aircraft ​carriers and instead go back to using steam catapults, the White House said on Thursday.

Trump signed a national ‌security memorandum ⁠directing the change which would require the removal of the ⁠electromagnetic catapult system used on Gerald R. Ford-class aircraft carriers and ​is expected ​to cost ​billions of dollars. ‌Huntington Ingalls is the primary contractor building Ford class aircraft carriers.

Trump has frequently criticized the Navy's electromagnetic launch system as being more expensive and ‌not as effective ​as steam catapults.

"Billions of ​dollars more ​they spent on electric ‌catapults and they're not ​good. They're ​not nearly as good, too complex," Trump said at a defense ​summit ‌in Pennsylvania last month.

(Reporting by Carlos ​Méndez in Mexico City; Editing ​by Franklin Paul)