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Even though the impeachment inquiry against President Donald Trump may seem like a lifetime ago now, you may recall the litany of career national security officials who complied with congressional subpoenas to testify what they knew about Trump's now-infamous interactions with the Ukrainian President.

You likely remember the sense of duty these officials displayed in answering each question truthfully to the best of their knowledge, regardless of whether or not it hurt the President—even if he attacked them on Twitter or fired them for it.

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