Meet the Press moderator Kristen Welker shut down Sen. Markwayne Mullin (R-OK)‘s repeated attempts to peddle a debunked claim that vaccines were linked to autism as he praised Robert F. Kennedy Jr.’s nomination for health and human services secretary. Welker questioned Mullin on whether Kennedy’s unfounded opinions on vaccines would be a dealbreaker in his quest to be confirmed for a cabinet position. Kennedy has frequently linked vaccines to autism, an assertion that has no basis in science and