Susan Monarez, President Donald Trump’s pick to lead the U.S. Centers for Disease Control and Prevention, told senators Wednesday that she values vaccines, public health interventions and rigorous scientific evidence, but largely sidestepped questions about widespread cuts to the agency, elimination of programs and whether she disagreed with any of Health Secretary Robert F. Kennedy Jr.’s actions to date.

“The secretary is doing the important work of leading a complex agency,” Monarez told members of a Senate health committee that will decide whether to advance her nomination.

Monarez, 50, is the first nominee for CDC director to require Senate confirmation. She was named acting director in January and the nominee for the post in March after Trump abruptly withdrew his first choice, David Weldon. Monarez is the former director of a federal biomedical research agency and a respected scientist, although she would be the first nonphysician to lead the CDC in decades.

Monarez repeatedly said she had not been involved in decisions earlier this year to cut hundreds of staff and eliminate CDC programs, but that she would work to retain the agency’s core functions and transition key programs to other parts of the Health and Human Services department.

Her answers appeared to frustrate some senators, including Virginia Democrat Tim Kaine, who said he had no questions about her qualifications. “I’ve got questions about your willingness to follow through on your values,” he said.

In the two-hour hearing, Monarez was sharply questioned about Kennedy’s recent move to fire all 17 members of a crucial committee that evaluates and recommends vaccines, his downplaying of the risks of measles during a nationwide outbreak and staffing cuts to a program that investigates lead poisoning in children.

Sen. Bill Cassidy, R-Louisiana and chairman of the committee, sought assurances about the scientific integrity of the CDC’s Advisory Committee on Immunization Practices, reconstituted by Kennedy to include vaccine skeptics.

“Someone can speak as a critic, but there should be someone who’s reviewing the overwhelming evidence of the safety of vaccines,” Cassidy said.

Monarez said she strongly supported public health interventions, including immunizations, saying, “I think vaccines save lives.”

“The ACIP has a very vital role to play,” she added. “And it must make sure that it is using science and evidence to drive that decision-making.”