Former Department of Veterans Affairs Secretary David Shulkin said that White House chief of staff John Kelly called to give him a heads up that he'd be fired via a tweet from President Donald Trump. (File Photo)

Former Department of Veterans Affairs Secretary David Shulkin said that White House chief of staff John Kelly called to give him a heads up that he'd be fired via a tweet from President Donald Trump. (File Photo)

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Shulkin says he was fired. The White House said he resigned. Here's why it matters.

Former Veterans Affairs Secretary David Shulkin has repeatedly insisted that the White House fired him from his job at the department. The White House says Shulkin resigned.