Washington (CNN) Wells Griffith, a White House adviser on energy, is one of several witnesses called on to testify before House impeachment investigators this week who did not show up Tuesday for a deposition.

He was scheduled to be deposed Tuesday, but he will not comply with impeachment investigators' request, a source involved in the deliberations told CNN. All four witnesses supposed to testify Monday did not show, and several others scheduled for this week have indicated they are not coming.

Griffith is a special assistant to the President and senior director for international energy and environment for the National Security Council. He joined the Trump administration in 2017 as a senior White House adviser for the Department of Energy and then became principal deputy assistant secretary in the department's Office of International Affairs.

At the UN COP24 climate change conference in Poland in 2018, he was mocked by protesters while promoting fossil fuels and coal.

He was born and raised in Mobile, Alabama, and attended St. Ignatius Catholic School. He graduated high school from St. Paul's Episcopal. He graduated from the Virginia Military Institute in 2004 with a bachelor of arts degree in history and a minor in modern languages (Spanish), according to his Linkedin profile

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