"As time went by it did not go up by much", Trump wrote.
Earlier Tuesday, President Donald Trump had reiterated his praise for the Federal Emergency Management Agency's response.
During his visit to the island, Trump suggested Puerto Ricans were lucky Hurricane Maria wasn't a "real catastrophe" like 2005′s Hurricane Katrina.
Two weeks ago, the death toll from September 2017's Hurricane Maria was increased to more than 46 times the previous official government tally.
"What may be millions of water bottles. meant for victims of Hurricane Maria, have been sitting on a runway in Ceiba, Puerto Rico, since previous year, according to @FEMA, which confirmed the news to me", Begnaud wrote.
The findings were embraced by the government of Puerto Rico as the study was released.
San Juan Mayor Carmen Yulín Cruz, who pleaded with Trump to send additional aid in the aftermath of the historic storms, hit back at Trump's death toll denial on Thursday.
Per CNN, the higher figure is "based on the findings of researchers from George Washington University in a study commissioned by the U.S. commonwealth's government".
"Puerto Rico was, actually, our toughest one of all because it's an island, so you just - you can't truck things onto it". He also said he was still waiting for Trump to respond to a petition to help Puerto Rico complete work on emergency housing restoration programs and debris removal.
"I ignore them because none of them make sense", said Michelle Cruz, a 48-year-old airline worker whose mother died in December from septicemia after contracting an infection in a hospital during surgery after Maria.
The report also found FEMA had been understaffed going into the hurricane season and that most specialized disaster staffers were deployed to the other storms when Maria struck.
"I think Puerto Rico was an incredible, unsung success", Trump said, speaking from the Oval Office, where he was briefed on efforts to prepare for Florence.
For many, Trump's boast about "one of the best jobs that's ever been done" was hard to square with their daily reality: Blackouts remain common; almost 60,000 homes are covered by only a makeshift roof not capable of withstanding a Category 1 hurricane; and 13 per cent of municipalities lack stable phone or internet service.
"Once the transfer of water took place, the water became property of the government of Puerto Rico", FEMA said.
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