Mark Penn, a long-time political advisor to both Hillary and Bill ClintonBill ClintonWashington needs high-level science and technology expertise – now! House lawmakers pitch ban on North Korean tourism GOP frustrated by slow pace of Trump staffing MORE, has stepped aside as chief strategist for Hillary ClintonHillary Rodham ClintonFederal judge drops lawsuit against Clinton over Benghazi Clinton: ‘I don’t die’ despite the right’s ‘best efforts’ Clinton: Comey firing is ‘an effort to derail and bury’ Russia probe 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.