Recent reports that the actual death toll on Puerto Rico from Hurricane Maria claim 2,975 people were killed as a result of the storm.
The studies concluding this are not based on discrete data, but on some form of a change in death rates. But the CIA World Factbook shows that death rates in Puerto Rico actually fell during the year of Hurricane Maria, strongly suggesting a flawed study.
Again, President Trump appears to be correct. The 2,975 death toll appears to have been grossly overstated. The chart below shows how the death rate has been increasing gradually since 2009 and actually declined for the first time in almost a decade in the year Maria devastated Puerto Rico.