NEW YORK — The Justice Department has appointed Todd Blanche, who previously defended Donald Trump during a high-profile criminal trial, as the acting librarian of Congress. This decision follows the recent dismissal of Carla Hayden, the longtime librarian, amid growing criticism from conservative circles over her management of the position.

Brian Nieves, currently a senior counsel in Blanche’s office, will serve as acting assistant librarian. Paul Perkins, a seasoned attorney within the Justice Department, has been appointed as the acting register of copyrights and director of the Copyright Office, taking over from Shira Perlmutter, who was removed last weekend.

In recent months, Trump has been active in reshaping the personnel within various governmental agencies, prioritizing candidates who align closely with his political agenda. Hayden, who was nominated by Barack Obama and confirmed in a Senate vote with significant bipartisan support, has been recognized for her leadership. She appointed Perlmutter to the Copyright Office in 2020.

The Library of Congress holds a vast repository of significant texts and historical materials, and the implications of a close Trump ally assuming its leadership role could be extensive. The acting librarian might have access to legislative requests made to the Congressional Research Service, a crucial arm of Congress that assists lawmakers in their decision-making processes.

Concerns have emerged from senior House Democrats regarding the potential for improper data transfers between the Library of Congress and the executive branch. Legislators, including Representatives Joe Morelle and Rosa DeLauro, are pushing for an investigation into how library data might have been mishandled, which they argue could threaten the independence of the legislative branch.

Internal communications within the Library of Congress have indicated that officials were engaged in discussions with the White House about Blanche’s appointment, raising questions about the library’s ability to operate independently from political influences.

Blanche previously served as the No. 2 official at the Justice Department after representing Trump in criminal cases brought during Biden’s presidency. Notably, he played an integral role in Trump’s defense during his New York hush money trial, which resulted in a conviction on multiple felony counts.

The response to Hayden’s removal has been largely negative, with both Democrats and former colleagues expressing their disapproval. Hayden was the first Black and first female librarian in the institution’s history, and many praised her efforts to uphold the library’s role in preserving American culture. Ada Limon, a former U.S. poet laureate, described Hayden as an exemplary figure who championed the library’s mission.

Additionally, the creators and performers of the Tony-nominated show “Dead Outlaw” have withdrawn plans for a visit to the library, citing Hayden’s advocacy for the arts as a critical factor in their decision. The community continues to reflect on her significant contributions during her tenure.