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WATCH: Schiff warns the Trump administration against obstructing impeachment investigation

House Intelligence Committee Chairman Adam Schiff has opened Wednesday’s impeachment hearing with a warning for President Donald Trump’s administration.

Schiff spoke on Nov. 20 publicly as part of the impeachment inquiry into President Donald Trump. Watch in the player above.

Schiff said the House has “not received a single document” from the administration as it has investigated Trump’s dealings with Ukraine. He said Trump and Secretary of State Mike Pompeo have made “a concerted and across the board effort” to obstruct the investigation and “they do so at their own peril.”

Democrats have said they are considering an article of impeachment against Trump for obstruction of Congress.

The committee is hearing testimony Wednesday from Ambassador Gordon Sondland, who says that “everyone was in the loop” in Trump’s administration as the president pushed Ukraine to open investigations into Democrats.

Schiff says, “The knowledge of this scheme was far and wide.”

MORE: A guide to the impeachment hearings

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