President-elect Donald Trump took a swipe at Lockheed Martin's F-35 program Monday morning, saying the cost was "out of control."

Shares of the aerospace company dropped more than 4 percent in early trade, but then recovered some of those losses, ending the day about 2 percent lower. After the tweet, the company's market value initially dropped $4 billion. The impact of Trump's tweet, per character, was more than $28 million.

Trump tweeted that "billions of dollars can and will be saved on military (and other) purchases" once he takes office in January.

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Lockheed Martin spokesman Bill Phelps said the company has invested large sums of money to reduce the cost of the F-35 stealth fighter program by 60 percent, correcting an earlier company estimate of 70 percent.

The company added it will welcome "the opportunity to address any questions the president-elect has about the program."

When Trump's transition team was asked by reporters about Trump's tweet, the team said a clear message is being sent that Trump will fight for taxpayers.

