A senior administration official said a decision had been made to take a harder edge against the disinformation, with plans in the coming days to call out Republican elected officials and specific social media platforms. "We are seeing the impact of the disinformation," a senior administration official said, who acknowledged the difficult balance the West Wing was trying to strike by injecting the President into the fray... Already, some of Biden's aides have begun taking a more assertive stance against Republicans who question the President's efforts to deliver vaccines to every American. Federal health officials -- including Dr. Anthony Fauci, the nation's top infectious disease expert who has been vilified in conservative media -- have consistently insisted the vaccine be removed from politics... It's not just voices on conservative outlets. The White House is also wrestling with how to combat vaccine misinformation on large social media platforms. In May, Biden's chief of staff, Ron Klain, confronted Facebook's Mark Zuckerberg about vaccine misconceptions he said stemmed from "postings on Facebook."