Lockheed falls as Trump tweets that F-35 program is costly

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  • FILE - In this July 7, 2006, file photo, the Lockheed Martin F-35 Joint Strike Fighter is shown after it was unveiled in a ceremony in Fort Worth, Texas. Shares of Lockheed Martin fell Monday, Dec. 12, 2016, as President-elect Donald Trump tweeted that making F-35 fighter planes is too costly and that he will cut "billions" in costs for military purchases. (AP Photo/LM Otero, File)

    FILE - In this July 7, 2006, file photo, the Lockheed Martin F-35 Joint Strike Fighter is shown after it was unveiled in a ceremony in Fort Worth, Texas. Shares of Lockheed Martin fell Monday, Dec. 12, 2016, as President-elect Donald Trump tweeted ... that making F-35 fighter planes is too costly and that he will cut "billions" in costs for military purchases. (AP Photo/LM Otero, File) (The Associated Press)

  • FILE - In this Wednesday, Sept. 2, 2015, file photo, an F-35 jet arrives at its new operational base at Hill Air Force Base, in northern Utah. Shares of Lockheed Martin fell Monday, Dec. 12, 2016, as President-elect Donald Trump tweeted that making F-35 fighter planes is too costly and that he will cut "billions" in costs for military purchases. (AP Photo/Rick Bowmer, File)

    FILE - In this Wednesday, Sept. 2, 2015, file photo, an F-35 jet arrives at its new operational base at Hill Air Force Base, in northern Utah. Shares of Lockheed Martin fell Monday, Dec. 12, 2016, as President-elect Donald Trump tweeted that making F-... 35 fighter planes is too costly and that he will cut "billions" in costs for military purchases. (AP Photo/Rick Bowmer, File) (The Associated Press)

Shares of Lockheed Martin fell as President-elect Donald Trump tweeted that making F-35 fighter planes is too costly and that he will cut "billions" in costs for military purchases.

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Lockheed makes the F-35 one-seat fighter aircraft for the U.S. and is a major defense contractor. The F-35 program made up 20 percent of Lockheed's total revenue last year.

This is the second time in a week that Trump has blasted U.S. aircraft spending. Last week, Trump tweeted that costs to build new presidential planes by Boeing Corp. were "out of control" and ended the tweet with "Cancel order!"

Representatives from Lockheed, based in Bethesda, Maryland, did not immediately have a comment.

Lockheed Martin Corp. shares fell 4.1 percent to $248.86 in morning stock trading Monday.