Mark Penn, a long-time political advisor to both Hillary and Bill ClintonWilliam (Bill) Jefferson ClintonBest-selling author jokes he knows 'what Pence must feel like' on book tour with Bill Clinton Bill Clinton blasts family separation: 'Children should not be bargaining chips' In memory of Charles Krauthammer, an American genius and dear friend MORE, has stepped aside as chief strategist for Hillary ClintonHillary Diane Rodham ClintonColorado governor teases possible presidential run Mueller asks judge for September sentencing for Papadopoulos House Judiciary Committee subpoenas FBI agent who sent anti-Trump texts MORE's presidential campaign. Penn has been mired in a controversy over his meeting with Colombia's ambassador to discuss a pending free trade deal, one that Clinton has opposed.

Penn asked to stepped down, though his polling firm will continue to advise the campaign, said Clinton campaign manager Maggie Williams in a press release.

Here's Williams' statement:

After the events of the last few days, Mark Penn has asked to give up his role as Chief Strategist of the Clinton Campaign; Mark, and Penn, Schoen and Berland Associates, Inc. will continue to provide polling and advice to the campaign.

Geoff Garin and Howard Wolfson will coordinate the campaign's strategic message team going forward.