In tweets, he accused Puerto Rico of a "total lack of accountability", adding that "electric and all infrastructure was disaster before hurricanes".
The island, whose 3.4 million residents are US citizens, is 90% without power, some three weeks after Hurricane Maria.
On Thursday, Congress approved a $36.5bn (£28bn) disaster relief bill.
The cross-party bill, which still requires Senate approval, provides emergency storm relief for Puerto Rico, Florida, Texas and the US Virgin Islands, as well as wildfire-ravaged California.