President Trump canceled a trip to Poland this weekend because of Hurricane Dorian's approach to Florida.

At an event to announce the establishment of U.S. Space Command, Trump said Vice President Mike Pence will take his place in attending events in Warsaw commemorating the 80th anniversary of World War II.

"To ensure that all resources of the federal government are focused on the arriving storm, I have decided to send our Vice President Mike Pence to Poland this weekend in my place. It's something very important for me to be here," he said on Thursday.

Trump said he will reschedule his trip to Poland and that he spoke to Poland's President Andrzej Duda.

Hurricane Dorian is expected to make landfall on the eastern shore of Florida as a "major" Category 4 storm by Monday. The latest advisory from the National Hurricane Center indicate catastrophic damage is possible. Maximum sustained wind speeds are projected to be 130 miles per hour by Sunday, enough for Dorian to be a Category 4 hurricane.

Gov. Ron DeSantis declared a state of emergency Thursday for the entirety of Florida, which will enhance local coordination with state and federal officials. "Every Florida resident should have seven days of supplies, including food, water and medicine, and should have a plan in case of disaster," the Republican said.

Earlier in the day Trump tweeted that Dorian could be "one of the biggest" hurricanes ever.