(CNN) Pete Buttigieg's campaign will begin to allow the press to cover his high-dollar fundraisers, the campaign announced on Monday after some of his Democratic presidential opponents called on him to be more transparent about the time he spends with top donors.

The South Bend, Indiana, mayor's campaign will also make the names of his so-called bundlers -- plugged in Democrats who help raise money for the campaigns -- public.

"In a continued commitment to transparency, we are announcing today that our campaign will open fundraisers to reporters and will release the names of people raising money for our campaign," said Mike Schmuhl, Buttigieg's campaign manager, in a statement. "Fundraising events with Pete will be open to press beginning tomorrow, and a list of people raising money for the campaign will be released within the week."

Buttigieg, more than any other Democratic candidate other than former Vice President Joe Biden, has spent a significant time on the campaign trail at top-dollar fundraisers, building a substantial campaign bank account that has helped fuel his unexpected rise from small city mayor to top tier Democratic presidential candidate.

But the mayor's rise has corresponded with more attention from his opponents like Massachusetts Sen. Elizabeth Warren, who has faulted Buttigieg for holding private events with top donors -- something she has not done during her presidential campaign -- and called on the mayor to open his future events to the press.

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