McGahn joined the Treasury Department as Counselor to the Secretary at the beginning of the Trump Administration. Before her time at Treasury, Shannon served the Financial Services Committee as Staff Director (2013-2017), Deputy Staff Director for Strategy and Public Affairs (2012-2013), and Deputy Chief of Staff for Communications (2010-2011). In addition to her work at the committee, Shannon has handled communications for three leadership offices, serving as spokesman for House Majority Leader Tom DeLay and Communications Director for Chairman Jeb Hensarling at the House Republican Conference. McGahn is the first Trump-era Treasury aide to leave the department. The announcement came one day after The New York Times reported that her husband, White House counsel Don McGahn, had asked Attorney General Jeff Sessions not to recuse himself from the Justice Department’s investigation of Russia’s involvement in the 2016 election.