Vice President Mike Pence said Friday that 21 passengers out of 46 tested aboard the Grand Princess cruise ship being held off the California coast have tested positive for the coronavirus.

Pence, who is leading the administration’s response to the outbreak, said all passengers would be brought into port in the U.S over the weekend and tested. There are over 3,000 passengers and crew on the ship, which received test kits dropped off by helicopter on Thursday.