Katherine Marie Walsh (born November 1, 1984)[1] is an American Republican political operative who served as White House Deputy Chief of Staff for Implementation in the Donald Trump administration.

Her past experience also includes serving as Midwest Regional Finance Director for the McCain–Palin campaign in 2008 and working for Friends of Fred Thompson, at the Ashcroft Group, and as a field representative for Missourians for Matt Blunt.

Her early political involvement came in high school when she worked as an intern for then-Senator John Ashcroft's unsuccessful 2000 reelection campaign.

[9][7] Walsh then worked as deputy finance director for the National Republican Senatorial Committee (NRSC),[6] implementing fundraising and political strategies for Senate campaigns during the 2010 and 2012 election cycles.

She was critical of the RNC's practice of sharing voter information with the Koch Brothers, saying "I think it's very dangerous and wrong to allow a group of very strong, well-financed individuals who have no accountability to anyone to have control over who gets access to the data when, why and how.

She told CNN that the RNC intended to look to polls less often in favor of "predictive modeling," which tracks voters' likelihood of voting for Republican candidates.

[8] According to The Wall Street Journal, Walsh had guarded access to the Oval Office on behalf of Chief of Staff Reince Priebus.