[5] Williams began her government career in the United States Department of Homeland Security in 2005, shortly after graduating from Georgetown.

"[12] However, Williams' supervisor Lt. Gen. Keith Kellogg, said Williams "never reported any personal or professional concerns to him regarding the call...In fact, she never reported any personal or professional concerns to any other member of the Vice President’s staff, including our Chief of Staff and the Vice President".

"[15] Williams has been recognized as one of the "powerful, professional women on both sides of the dais who have emerged as major figures in the impeachment investigation into President Donald Trump," and one of the witnesses who have "held their own" in the face of partisan attacks.

[17] Williams, who started her government career in the Bush administration and called former Secretary of State Condoleezza Rice “a personal hero of mine,” denied being a “Never Trumper.”[18] On December 6, 2019, House Intelligence Committee Chairman Adam Schiff requested in a letter to Pence that he declassify more material related to Williams' testimony in the House impeachment investigation.

Pence had already announced that he was willing to release transcripts and documents related to his September 18, 2019 phone call with Ukrainian President Zelensky.