Washington (CNN) The US State Department's top diplomat focused on Europe policy has resigned his post, effective February 15.

In a letter to Secretary of State Mike Pompeo dated January 4, Assistant Secretary for European and Eurasian Affairs A. Wess Mitchell said, "I feel that I have completed what I set out to do in taking this position."

Mitchell, who took on the role October 2017, said he was proud of the accomplishments made under his tenure but said "the time has come for (him) to spend more time with (his) young family."

In a tweet Tuesday, Pompeo commended Mitchell for "an outstanding job" in the role.

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