Trump targets Lockheed Martin's F-35 fighter jet costs

U.S. President-elect Donald Trump speaks at the USA Thank You Tour event at the Iowa Events Center in Des Moines, Iowa, U.S., December 8, 2016. REUTERS/Shannon Stapleton/File Photo

WASHINGTON (Reuters) - Donald Trump on Monday widened his attack on defence contractors, slamming Lockheed Martin's F-35 fighter jet programme as too expensive as aides to the president-elect said he intends to keep pushing to cut the costs of military hardware.

Lockheed shares dropped 3.4 percent and other defence contractors also tumbled.