Labor Secretary Tom Perez , one of the leading candidates for chair of the Democratic National Committee, has stumbled in recent days when asked about his position on money in politics.

Asked at a DNC forum in Phoenix last Saturday whether he will “revive President Obama’s ban on corporate donations to the DNC” and a ban on appointing lobbyists as party leaders, Perez demurred.

“It’s actually not that simple a question,” Perez responded, adding that such a move might have “unintended consequences.” Perez argued that such a ban might impact “union members who are lobbyists,” though the question explicitly only addressed corporate lobbyists.

Speaking to the Huffington Post, Perez has refused to clarify his position on resurrecting President Obama’s ban on lobbyist donations to the DNC, which was overturned by former DNC Chair Rep. Debbie Wasserman Schultz, D-Fla., during Hillary Clinton’s bid for the presidency.

The only firm restriction on special-interest money Perez has announced is that he will not accept lobbyist donations for his own campaign committee formed to support his bid for DNC chair. But even this position has come under question.

The Intercept recently obtained a fundraiser invite for Team Tom, Perez’s DNC chair campaign committee, for an event on January 26 in Washington, D.C. The event invite clearly prohibits lobbyist money, but the host committee — the individuals sponsoring the event — included several federally registered lobbyists and individuals working in the lobbying industry: