Mr Trump, who will visit the island on Tuesday, added that Puerto Rico "was totally destroyed" and "10,000 Federal workers now on the island are doing a fantastic job".
Maria, the most powerful storm to strike Puerto Rico in almost 90 years, has destroyed roads, making it hard to deliver aid and move the heavy equipment needed to fix damaged infrastructure across the island.
Trump also lashed out at comments made by San Juan Mayor Carmen Yulin Cruz at a press conference on Friday.
Puerto Rico, home to more than 3 million US citizens, has had limited food, bottled water and medical supplies since Hurricane Maria struck nine days ago.
"Obviously, I imagine it's not a lack of truckers situation, it's a lack that the business gets started so they can send the truckers to pick up the cargo", Corrada said.
The leader of Puerto Rico's capital city says she knows "the good heart of the American people and I know that when a mayday sound goes off, they come to the rescue". Yet even in voicing solidarity and sympathy with Puerto Rico, he drew attention again to the island's debt burden and infrastructure woes, leaving doubt about how far Washington will go to make the US territory whole.
San Juan resident Judith Berkan said power shortages and long lines for cash, food, gasoline and medical attention were wearing people down. She also said the death toll had been low for a storm the size of Hurricane Maria.
"I'm not a hero here", said CBS News' David Begnaud, who has been in Puerto Rico since before Maria hit on September 20.
This follows Cruz's tearful plea to the government to help on Friday, standing in front of palettes of food and water donated by other people. Trump, from his golf club in New Jersey, took to Twitter to accuse Cruz of partisan politics.
Asked about the reaction to her remark, Duke says: "There is so much more to do. And they deserve all the help we can give them, and they deserve to have it faster", said Lt. Gen. Buchanan.
Trump tweeted after Cruz criticized the White House's response to Maria's disastrous impact on the U.S. commonwealth.
Ten days after Hurricane Maria ravaged Puerto Rico, the USA territory's governor approved a moratorium on rent payments for those living in public housing as residents struggle to recover from the devastating storm. Trump said his administration "will not rest" until people there are safe. "For the last two days, we've been very involved in figuring out how we can get major amounts of cash to Puerto Rico".
Trump is planning to visit the US territory on Tuesday.
With thousands of cargo containers filled with necessary supplies that have arrived at a port in San Juan not yet distributed, Rossello told reporters Saturday that his government will purchase some of the crates to make sure they get to those in need across Puerto Rico.
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