Democratic lawmakers are intensifying scrutiny of private donations made to the White House ballroom renovation project overseen by the Trump administration, demanding additional details about the donors and the circumstances surrounding their contributions.

Senator Richard Blumenthal (D-Connecticut), the top Democrat on the Senate Permanent Subcommittee on Investigations, sent letters on Tuesday to 14 previously undisclosed donors, seeking information about how their donations were solicited, whether administration officials suggested specific amounts, and why some donors chose to remain anonymous. The contributions range widely, from $100,000 to as much as $25 million.

Blumenthal expressed concerns that the donations carry the appearance of pay-to-play, noting that many of the contributing corporations and individuals have ongoing matters before the federal government. He indicated that the inquiries reflect an effort to understand whether public interests were compromised by the fundraising efforts. Blumenthal also stated his intent to pursue a more comprehensive investigation into the ballroom donations if Democrats regain control of the Senate after the upcoming midterm elections, with the possibility of employing subpoena power.

The scrutiny follows a recent report revealing previously undisclosed major contributors to the White House ballroom renovation. Some donors have benefited from regulatory decisions, government contracts, and, in one case, a presidential pardon issued during the Trump administration. Unlike traditional political donations, which are subject to public disclosure and federal campaign finance regulations, these contributions were funneled through a nonprofit organization before being transferred to the National Park Service, which then moved the funds into a White House account under the president’s direct control.

Independent experts and legal scholars have raised concerns about potential conflicts of interest and the risk of influence buying or coerced donations under this arrangement.

Among the individuals and entities that Blumenthal has queried are Charlie Ergen, co-founder of EchoStar and Dish Network; technology firms Cisco Systems, Salesforce, and ServiceNow; Vast Space, a developer of space station technologies; Kraken, a cryptocurrency exchange; lobbyist and Trump adviser Jason Miller; and Isabela Herrera, the daughter of a banker pardoned by the president. Representatives for some of the donors either declined to comment or had not responded as of Tuesday evening.

White House spokesperson Davis Ingle defended the project in a brief statement, asserting that critics who allege conflicts of interest would object if taxpayers had funded the renovations instead.

Other leading Democrats have echoed calls for a full investigation. Senator Elizabeth Warren (D-Massachusetts), the top Democrat on the Senate Finance Committee, condemned the donations as “a blatant pay-to-play scheme,” accusing wealthy donors of buying influence while ordinary Americans bear the costs. Representative Jared Huffman (D-California), ranking member on the House committee overseeing the National Park Service—the agency that handles the donations—emphasized the need for transparency and accountability regarding who contributed and what recipients may have been promised.

As of Tuesday, prominent Republicans in Congress had not publicly addressed the emerging controversies over the ballroom donor list.