Shares of Lockheed Martin, the maker of the F-35 fighter jet, are falling after President-elect Donald Trump once again attacked the cost of the program during his press conference on Wednesday.

During the press conference, Trump said that he had been having discussions with generals and other admirals about bringing down the costs of the F-35 program.

“I’m very much involved with the generals and admirals on the airplane, the F35 you’ve been reading about it. And it’s way, way behind schedule and many billions of dollars over budget. I don’t like that,” said Trump during the press conference.

Trump said that he is “going to do some big things on the F35 program and perhaps the F18 program” and “going to get those costs way down.”

The comments are similar to a tweet from Trump in December criticizing the cost of the F-35 program and saying Trump would renegotiate the prices.

Expert say that much of the cost of the F-35 program have already been committed and that it is most likely too late to make significant changes to the program.

Following the comments, shares of Lockheed slid sharply in trading down 1.17% as of 11:40 a.m ET, a $3.01 per share drop.