President Trump said on Thursday that he did not know hurricanes could be rated as high as a Category 5 after his visit to Florida, which is reeling from Hurrican Irma's devastation.

"I never even knew a category five existed," the president told reporters at the White House.

Trump was commenting on his visit to South Florida on Thursday, during which he met with victims of Hurricane Irma, which made landfall in the state on Sunday as a Category 4 hurricane.

Hurricane Irma was a Category 5 hurricane for three days and three hours, the second-longest for any storm on record.

The storm wreaked havoc on the Caribbean before continuing to Florida.

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"It's been a rough time for Florida," Trump said, adding that his administration did an "A plus job" responding to the storm and its aftermath.

The president earlier on Thursday said that there have been bigger storms than Hurricane Harvey and Hurricane Irma, dismissing the notion that climate change played any part in the powerful storms.

Climatologists have said that while climate change didn’t cause the two monster storms, it likely exacerbated them and made them stronger.