US President Donald Trump on Thursday canceled a trip to Poland as Hurricane Dorian bore down on Florida, where it could make landfall as a dangerous Category 4 storm.

Trump, who had been scheduled to attend World War II anniversary commemorations in Poland this weekend, said he would focus instead on preparations for the approaching hurricane.

“Our highest priority is the safety and security of the people in the path of the hurricane,” he told reporters in the White House Rose Garden.

Vice President Mike Pence would go to Poland in his place, Trump said.

He called his Polish counterpart Andrzej Duda to apologize for the cancelation, saying the storm could be “catastrophic,” the president’s chief of staff Krzysztof Szczerski said, according to the PAP agency.

Weather forecasters said Dorian, currently a Category 1 storm — the lowest on a five-level scale — could make landfall as a powerful Category 4 hurricane with the potential to cause life-threatening storm surges.

Florida’s governor declared a state of emergency in all 67 of the state’s counties, warning the millions of people who live up and down the eastern coast of the “Sunshine State” to prepare for a potentially major hurricane.

“All Floridians really need to monitor Hurricane Dorian and make the necessary preparations,” Governor Ron DeSantis said. “Have your plan and make those preparations right now.”

Georgia — another southeastern state potentially in the storm’s path — followed suit for 12 counties.

Governor Brian Kemp said the storm “has the potential to produce catastrophic impacts to citizens” throughout the southeast coastal region of the United States.

Trump, who has properties including the Mar-a-Lago resort in Florida, a politically important state for his 2020 re-election bid, also warned Floridians to get ready.

Miami’s Ocean Drive, a normally-vibrant strip along the beach, was abnormally quiet, with some empty tables and fewer tourists than usual.

Grocery stores were full of shoppers making last-minute purchases of water, food, propane canisters and other supplies. There were lines at some gasoline stations as drivers filled up their tanks.

A Rolling Stones concert originally scheduled for Saturday night was moved up by a day “due to the weather forecast,” the band’s Twitter account said.

In its latest advisory, the NHC said Dorian was a Category 1 hurricane with maximum sustained winds of 85 miles per hour (140 kilometers per hour), and that it was forecast to make landfall in Florida on Monday.