The presidential campaign of South Bend, Indiana, Mayor Pete Buttigieg announced Monday that it would allow members of the news media to cover future private fundraisers and would disclose the names of super donors known as bundlers.

Reporters will be permitted to cover Buttigiegs fundraisers starting on Tuesday and the campaign will provide the names of bundlers, who solicit multiple donations from other wealthy individuals, by the end of the week, according to a statement from campaign manager Mike Schmuhl.

From the start, Pete has said it is important for every candidate to be open and honest, and his actions have reflected that commitment, Schmuhl said.

Buttigieg had been under growing pressure in recent days to improve his campaigns financial transparency.

Of the four Democratic candidates leading in the polls, only Buttigieg and former Vice President Joe Biden have requested donations in private, high-dollar fundraisers. Biden has allowed reporters to cover those fundraisers.

And while Buttigieg began his campaign by publicly releasing the names of his bundlers, he has not updated his public list of bundlers since April, according to the Center for Responsive Politics. (No other candidate who relies on bundlers, including Biden, has so much as begun to publicly identify them.)

For their part, Sens. Bernie Sanders (I-Vt.) and Elizabeth Warren (D-Mass.), the progressives who, on average, lead Buttigieg in national polls, do not raise money in private fundraisers. (Sanders has gone so far as to actively refuse donations from billionaires, returning a $470 check contributed by Marta Thoma Hall, a Sanders supporter married to a billionaire.)

Warren and her team have been engaged in a war of words with Buttigieg and his campaign, pressing the mayor to release more information about his donors and provide press access.

Buttigiegs decision to open up his fundraisers and bundler list is at once a concession to rising scrutiny and yet another escalation in a transparency arms race that has gripped a Democratic presidential primary field that remains 15 people strong .

There are important differences in this race among Democratic candidates, from creating a choice of affordable health care choices for all to removing cost as a barrier to college for those who need it, but transparency shouldnt be one of them, Schmuhl said.

Buttigiegs success as a candidate has depended to a large degree on the unusual amount of access he has given political reporters. He has invited reporters to join him on three multi-day bus tours through Iowa and New Hampshire, where he hosted hourslong sessions of on-record discussion.

But Buttigieg combined a freewheeling style with a closed-door policy toward his lucrative private fundraisers and a strategy of delay when it came to questions about his nearly three-year stint at the global consulting firm McKinsey & Company.

Buttigieg and his aides initially claimed that details about his tenure at the company, from 2007 to 2010, would have to remain secret until McKinsey agreed to Buttigiegs request to be released from a nondisclosure agreement he had signed with the company before departing.

But the mayors rise in the polls he leads in the first-in-the-nation caucus state of Iowa ratcheted up scrutiny of his early career, and he faced renewed calls from progressive transparency advocates to release the details of his work for McKinsey. By Thursday, he had lost the influential editorial board of The New York Times, which called on him to end his untenable vow of silence .

The following evening, on the first day of another campaign swing through Iowa, Buttigieg released a summary of the types of clients he served at McKinsey that nonetheless omitted the clients names. At the same time, he pointedly refused to violate the nondisclosure agreement he had signed with the company that bars him from revealing clients names, citing his commitment to honor his promise to McKinsey. He called on the firm instead to do the right thing and release him from his obligations. (McKinsey announced on Monday afternoon that it would oblige Buttigiegs request.)