The National Hurricane Centre (NHC) predicted that Irma's eye wall is due to strike part of the Florida's 120-mile Keys, home to 73,000 people, early on Sunday.
U.S. President Donald Trump was briefed on Sunday about the path of Hurricane Irma and preparations made to respond to the storm by the director of the Federal Emergency Management Agency, the White House said.
Hurricane Irma wreaked havoc on the west coast and much of Florida on Sunday.
Referring to people in the Florida Keys who don't plan to evacuate, Long said, "You're on your own until we can actually get in there, and it's safe for our teams to support local and state efforts". "Heed the advice of @FLGovScott!" wrote Trump.
After a cabinet meeting in Camp David, about 60 miles (96 km) from D.C., President Trump urged Floridians to comply with evacuation advisories.
"I think now, with what's happened with the hurricane, I'm gonna ask for a speed up", he said.More news: 3 defensive keys for Cardinals in Week 1 vs. Lions
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"My administration is monitoring the situation around the clock, and we're in constant communications with all of the governors, with the state and local officials", Trump said in a video of the meeting released by the White House. Trump said he would also be discussing the latest on North Korea and tax reform.
The President's main concerns are the people in the affected areas and ensuring a "whole-of-government response", said acting Homeland Security Secretary Elaine Duke, who participated in the briefing. Congress acted quickly to pass the $15.3 billion deal and send it to Trump, who signed it Friday after he arrived at the Maryland retreat. Trump has also given Congress six months to resolve the status of individuals who were brought to the USA illegally as children after he decided earlier this week to end an Obama administration program that allowed them to live, work and attend school without fear of being deported.
President Donald Trump, accompanied by first lady Melania Trump, departs the White House for Camp David Sept. 8 in Washington, D.C.
Vice President Mike Pence and other Cabinet members also visited FEMA's headquarters Sunday afternoon.
Trump expressed his condolences for the victims of Irma and Harvey, which struck Texas and Louisiana earlier this month, the Hill reported.