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Donald Trump and his Twitter account continue to dominate headlines on this Monday, which forecasts one heck of a week for ongoing cabinet selections amid the Russia and China situations. Trump is not only the future leader of the free world but — underneath it all — a celebrity, which grants him great influence on Twitter. Today, Trump proved that a single tweet can severely impact a company’s bottom line.

That’s what happened with Lockheed Martin, which recently finalized a $6.1 billion deal with the Pentagon to produce the stealthy F-35 fighter jets. The company’s stock took a major hit when Trump slammed the F-35 program’s cost and hinted that, come Inauguration Day, “billions of dollars” may no longer be spent on a certain defense contractor.

The F-35 program and cost is out of control. Billions of dollars can and will be saved on military (and other) purchases after January 20th. — Donald J. Trump (@realDonaldTrump) December 12, 2016

Let’s take a look at that plummeting stock, shall we?