The Caribbean island has been without power for a week and is suffering shortages of reliable drinking water.
Cruz on Friday also bristled at suggestions that the relief effort had been well-coordinated. He blamed the island's financial woes and ailing infrastructure for the difficult recovery process.
Celebrity members of America's Puerto Rican community have been leading aid efforts, as Jennifer Lopez, who lost contact with family members on the island for almost a week, has teamed up with ex-husband Marc Anthony to launch a relief alliance.
Critics of the act had said that Trump, who temporarily waived the act in Texas and Florida after storms hit, cared more about a few U.S. shippers than he did about 3.4 million people living in Puerto Rico. "Puerto Rico was totally destroyed".
However, the fact of the matter is that grocery pick-up is not an option at the Walmart locations in Puerto Rico.
In the past month, a series of powerful hurricanes have lashed southern states and U.S. islands, leaving death, flooding and destruction of communications and medical systems in their wakes.
The response to Trump's attack on Cruz and others was withering, with one person asking: "Why attack the mayor of a city devastated by a hurricane?" They're trying very, very hard, I will tell you that.
"No organization on the planet is better at disaster response than our military".