On June 20, nearly three weeks into the Atlantic hurricane season, Florida disaster-management officials assembled a group of emergency relief contractors in Tallahassee and asked them to do something they had never done before.

Florida Republican Gov. Ron DeSantis confirmed on Monday that Trump will attend what's expected to be the official opening of the facility, which is estimated to cost $450 million a year. The expenses are to be incurred by Florida and reimbursed by the Federal Emergency Management Agency, a U.S. official said.