Mark Penn, a long-time political advisor to both Hillary and Bill ClintonBill ClintonWe must act now and pass the American Health Care Act Trump's message: Russia First or America First? Senate Democrats should grill Judge Gorsuch on antitrust. Here's how. MORE, has stepped aside as chief strategist for Hillary ClintonHillary Rodham ClintonPerez, Ellison start multistate ‘turnaround tour’ for Dems Watergate reporter on Russia: 'I’ve been saying for a while there’s a coverup going on' White House distances Trump from Manafort 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.