President Joe Biden spoke with Florida Gov. Ron DeSantis Thursday morning to discuss support for the state in response to Hurricane Ian and the disaster declaration the president approved overnight, White House press secretary Karine Jean-Pierre said in a tweet.

"The President told the Governor he is sending his FEMA Administrator to Florida tomorrow to check in on response efforts and see where additional support is needed. The President and Governor committed to continued close coordination," she wrote in a tweet.

Biden first spoke to the governor, a leading political opponent of Biden and possible 2024 Republican presidential candidate, on Tuesday after several days of questions about whether the two would connect.

-ABC News' Justin Gomez

Hurricane Ian caused extensive and "historic" impact and damage in across Florida, Gov. Ron DeSantis said at a press conference Thursday.

"The impacts of this storm are historic and the damage that was done has been historic and this is just off initial assessments. There's going to be a lot more assessing that goes on in the days ahead," DeSantis said.

"But I think we've never seen a flood event like this. We've never seen storm surge of this magnitude and it hit an area where there's a lot of people in a lot of those low-lying areas and it's going to end up doing extensive damage to a lot of people's homes," he said.

As of 6 a.m., there are 2.02 million customers without power, according to DeSantis.

DeSantis said Charlotte and Lee counties are "basically off the grid at this point." The areas will likely need a rebuilding of their infrastructure.

Ian, now a tropical storm, is near Florida’s east coast and is moving back over water. Ian is expected to re-intensify and could be at near-hurricane strength when it approaches the coast of South Carolina on Friday.

A hurricane watch has been issued for South Carolina and the Georgia coast.

Ian is producing catastrophic flooding over east-central Florida and is expected to produce life-threatening flooding, storm surge and gusty winds across portions of Florida, Georgia and the Carolinas.

There are already more than 14,000 customers without power in Georgia.

-ABC News' Max Golembo

Hurricane Ian caused serious damage to the city of Punta Gorda's water system, leaving it empty, the city said in an alert sent out to residents.

Water services will be restored as repairs are made, but the city warned it may take days to complete the repairs, officials said.

The city is under a boil water notice.

Officials set up a water fill station for residents and additional water availability has been requested through the Emergency Operations Center, the city said.

Caribbean islands such as Jamaica and Grand Cayman will start to experience the effects from the outer bands of Tropical Storm Ian within the next 24 hours, forecasts show. The islands will experience conditions such as heavy rain, possible flash flooding and storm surge.

The storm system will begin to rapidly intensify overnight into Monday before it closes in on western Cuba on Monday night.

As of 2 p.m., the sustained winds in the tropical storm remained at 50 mph as it moved west-northwest at 12 mph, the center about 265 miles away from Grand Cayman.

Hurricane warnings are in effect for Grand Cayman and western Cuba, while tropical storm warnings and watches are in effect in other portions of both islands.

As a hurricane, Ian is expected to peak at a Category 4 before weakening slightly as it looks to make landfall on the west coast or panhandle of Florida in the coming days.

There is still some uncertainty to the track Ian will take once the system enters the Gulf of Mexico.

The center of the storm and the worst of the impacts could end up heading toward the western coast of Florida's peninsula, including the Tampa area. The other possible scenario has the storm moving more due north and bringing a possible landfall along the Florida peninsula, impacting cities like Panama City and Tallahassee with more direct effects.

The storm will begin to impact the Florida keys and the southern portions of the state by Tuesday night.

-ABC News' Dan Peck