KEY POINTS
  • Travel restrictions become irrelevant in a potential pandemic because "you can't keep out the entire world," a top U.S. health official said.
  • Trump administration officials braced the public on Tuesday for its eventual spread here.
  • "When you have multiple countries involved, it's very difficult to do; in fact, it's almost impossible," Dr. Anthony Fauci told CNBC.

Stringent travel restrictions imposed on inbound flights from China to contain the coronavirus outbreak become "irrelevant" in a potential pandemic because "you can't keep out the entire world," a top U.S. health official said a day after the Trump administration braced the public for its eventual spread here.

"When it was focused only on China, we had a period of time, temporary, that we could do a travel restriction that prevented cases from coming into the U.S.," Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, told CNBC's "Squawk on the Street." "When you have multiple countries involved, it's very difficult to do; in fact, it's almost impossible."