"We'll handle it. We're ready, we're able, we've got the finest people I think anywhere in the world", he added in a video message posted on his Twitter account.
Trump first boasted of the "incredibly successful" job the administration did in Puerto Rico, when asked if there were lessons learned from response to that hurricane, as he commemorated the 17th anniversary of the terrorist attack that killed 3K in NYC, Virginia and Pennsylvania.
Puerto Rico Governor Ricardo Rossello also criticised Trump for not providing additional federal funds still needed for emergency housing and debris removal.
The discovery comes as an independent study by George Washington University recently found that almost 3,000 people died as a result of Hurricane Maria, a dramatic increase from the initial estimate of 64.
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In subsequent tweets Wednesday morning, Trump asserted that officials, including those at the Federal Emergency Management Agency, are ready to respond, and he warned coastal residents to take precautions.
The storm, which devastated the territory last September, is also estimated to have caused $100 billion in damage.
Breaking from presidential tradition, Trump continued to use the Category 4 hurricane barreling toward the coast as an occasion to high-five himself for his administration's response to the hurricane that slammed Puerto Rico last season.
Trump said Tuesday that Tropical Storm Isaac, which had been downgraded from hurricane status overnight, now poses a threat to Puerto Rico.
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He called Maria "the worst natural disaster in our modern history" and said many people are still struggling.
San Juan Mayor Carmen Yulín Cruz, who has been a vocal critic of the administration's handling of the storm, cast blame on the federal government for failing to provide adequate assistance in the aftermath of the storm.
The states of Virginia, North Carolina and SC haven't seen a storm of such size and intensity in 25 years or perhaps ever, Trump said.
"My teams knew about it but first they will say, "no we cannot use them, ' months later water was no good for human consumption", he tweeted". We are totally prepared.
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Ottmar Chavez, now administrator of Puerto Rico's General Services Administration, said FEMA reported that it had about 20,000 pallets of bottled water in excess in May this year, before Chavez was appointed. North and SC and Virginia ordered mass evacuations along the coast.