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Secretary of State Mike Pompeo is expected to speak to reporters at the State Department on Tuesday.
The appearance comes amid a swirl of rumors surrounding the top U.S. diplomat, who has become a major figure in the House impeachment inquiry into President Donald Trump and who is reportedly looking for an exit from the administration.
Trump mentioned Pompeo in a tweet minutes before the appearance was set to begin.
"I would love to have Mike Pompeo, Rick Perry, Mick Mulvaney and many others testify about the phony Impeachment Hoax," Trump claimed on Twitter.