Rolleyes emoticon goes here.

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....Witnesses routinely invoke their Fifth Amendment rights in testimony to Congress. Allies of President Donald Trump, for example, invoked their rights when refusing to testify to the committee that investigated the Jan. 6, 2021, attack on the Capitol by a mob of his supporters.

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https://www.yahoo.com/news/bidens-former-doctor-refuses-answer-144209140.html

I'm no lawyer; but can you plead the Fifth in a non-criminal """investigation"""???

Kinda wonder where that guy works, and how many of his patients now want a second opinion.