The DNC’s prohibition on lobbyist donations was instituted in 2008 at the behest of then-presidential candidate Barack Obama, who told voters: “They will not fund my party.” Clinton’s current Democratic primary opponent, Vermont Sen. Bernie Sanders, has pushed her to demand the DNC reinstate the lobbyist contribution ban. Clinton is already the top recipient of money from lobbyists in the 2016 campaign, the New York Times reported.

One of the lobbyists headlining the upcoming event, Elmendorf, donated $33,400 to the Hillary Victory Fund in October, months before the DNC said publicly it had lifted its contribution ban. A former chief of staff to then-Democratic House leader Richard Gephardt, Elmendorf is registered to lobby for Wall Street mega-bank Citigroup and entertainment and media company News Corporation.

Records show that Elmendorf previously lobbied for Goldman Sachs — a firm that’s been criticized by Sanders, and which paid Clinton $675,000 in speaking fees. (She has refused to release transcripts of those speeches.) Elmendorf also lobbied Congress on behalf of the Colombian government to pass the Colombia Free Trade Agreement — a deal that Clinton opposed before pressing lawmakers to support it in her role as secretary of state. Elmendorf has raised $172,320 worth of donations for Clinton's campaign, according to Yahoo.

Though Clinton bragged that drug companies dislike her, her supporter Forbes — a former chief of staff to Democratic Sen. Max Baucus — lobbies for Pharmaceutical Research and Manufacturers of America (PhRMA), the primary trade association representing the industry in Washington. In 2011, PhRMA paid Bill Clinton $200,000 for a speech while the organization was lobbying the Hillary Clinton-led State Department. PhRMA has pressed for the proposed 12-nation Trans-Pacific Partnership. Clinton and her staff supported the pact, but she reversed her position after becoming a presidential candidate, and she now opposes the deal.