An "urgent" meeting between the State Department's inspector general and senior members of Congress on Wednesday centered on what one lawmaker called a "mysterious" envelope sent to the diplomatic service's headquarters and containing conspiracy theories about senior officials President Donald Trump has targeted in recent weeks.

Rep. Jamie Raskin, who attended the hastily organized briefing on Capitol Hill Wednesday afternoon, showed reporters afterward photocopies of an envelope with ornate calligraphy addressed to Secretary of State Mike Pompeo with a return address of the White House. It contained folders supposedly from the Washington, D.C. hotel on Pennsylvania Avenue that Trump owns.

The Maryland Democrat said the envelope contained documents pertaining to conspiracy theories aimed at former U.S. Ambassador to Ukraine Marie Yovanovitch – whom Trump recalled in May – and former Vice President Joe Biden, both of whom have been at the center of unsubstantiated and disproven claims repeated by Trump about their activities regarding the former Soviet country.

State Department Inspector General Steve Linick's office first learned of the existence of the envelope in May. But he believed he should share its existence with Congress this week, Raskin said, amid newly launched investigations by lawmakers into concerns Trump tried to use his position to influence Ukrainian President Volodymyr Zelenskiy – and perhaps other foreign leaders – to help him politically.

Details of a July 25 call between the two leaders prompted House Democrats to begin impeachment inquiries against Trump. Also facing scrutiny is Trump's private lawyer, former New York Mayor Rudy Giuliani, who reportedly traveled to Ukraine in an attempt to gather political support for the administration and potentially compile information damaging to the president's political foes.

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Raskin on Wednesday said he did not know whether Pompeo received the envelope, whether he distributed it to anyone else or whether the secretary himself turned it over to the inspector general.

"This is my interpretation of it: There may be misconduct by the secretary of state or other State Department employees in distributing this if they know where it comes from," Raskin said. "It's very clear what it is: It is a package of propaganda and disinformation and conspiracy theories. The real question is where it came from and how it ended up in our lap."

Some reporters citing anonymous sources indicated earlier Wednesday that the meeting was organized to discuss reports of internal harassment among State Department leaders against colleagues they perceived to be working against Trump's interests. Raskin said that did not come up at the briefing, nor was that any part of the reason for holding it.