Trump will travel with Vice President Mike Pence and first lady Melania Trump. As of Wednesday afternoon, 3.7 million customers still were without power, according to state statistics. Hurricane Harvey dropped record rains and caused flooding in Texas.
Last week, Trump cut a deal with Democrats in Congress to provide more than $15 billion in disaster aid for Harvey, while raising the US government's borrowing limit and funding the government through December 8.
Since Irma made landfall on Sunday, 13 people in Florida have been killed in storm-related circumstances - in some cases during the cleanup efforts - in addition to those who died at the nursing home.
Sarah Sanders, the White House press secretary, made the announcement during Tuesday's daily briefing.
Other elements of his first trip to Texas struck an awkward tone: the first lady's stiletto heels, worn while boarding Marine One at the White House, drew widespread backlash on social media, and Trump's comments to a gathering of supporters - "what a great turnout!" - were more valedictory than comforting. White House officials acknowledged that assuming the "comforter in chief" role was harder than it appears on television. "But I know that at a certain point it ends for you, and we can't let it end", Trump said.
Trump is touring the storm damage in Florida, where many remain swamped and without electricity. "We are there for you 100 percent", he said, adding, "this is a state that I know very well".
"What do I know, but I hope this man right here, Rick Scott, runs for the Senate", Trump said in Fort Myers. "So I hope he runs for Senate".
Hurricane Irma has slammed into southwest Florida, threatening to bring risky storm surges to coastal areas, already battered by the hurricane's powerful winds. More than 6.5 million homes and businesses lost electricity in Florida, and fuel shortages plagued much of the state. Emergency crews around Florida are moving elderly residents from nursing homes without power, after eight people died in one sweltering facility.