House Republicans launched an investigation on Monday into the efforts of a prominent youth transgender medicine physician to withhold results from a federally funded study on the mental health effects of puberty blockers for political reasons. 

Dr. Johanna Olson-Kennedy, medical director for the Center for Transyouth Health and Development at Children’s Hospital Los Angeles, said she was delaying publication of the results from a multiyear study funded by the National Institutes of Health for fear that her findings could be used by critics of transgender medicine for minors.