Infectious disease expert Dr. Anthony Fauci said Friday he’s too busy to visit the U.S.-Mexico border and that it’s not his role to do so, responding to questions about Republican criticism that he’s been silent on the throngs of people entering the country from COVID-19-infected regions. Fox News’ Neil Cavuto asked Fauci a series of questions about the torrent of criticism from prominent Republicans, who have accused the infectious disease expert of staying mum on COVID-19-positive illegal immigrants and who have complained Fauci is not using his influence to persuade the Biden administration to do more to stem the border surge. Cavuto cited remarks by Sen. Lindsey Graham (R-S.C.), who in a tweet Friday became the most recent GOP lawmaker to take aim at Fauci, saying he needs “to go to the southern border and witness in person the biggest super spreader event in the nation—President@JoeBiden’s immigration policies.” “These are …