From the article, below:
"President Trump has discussed dismissing the intelligence community’s inspector general, Michael Atkinson,
because Mr. Atkinson reported a whistle-blower’s complaint about Mr.
Trump’s interactions with Ukraine to Congress after concluding it was
credible, according to four people familiar with the discussions."
https://www.nytimes.com/2019/11/12/us/politics/trump-michael-atkinson-inspector-general.html