White House Press Secretary Sarah Huckabee Sanders confirmed the act was lifted Thursday morning, and it "will go into effect immediately".
Last night, the chairman of the American Maritime Partnership told CBS4 News, shippers were not in favor of waiving the act.
The department said then that there were sufficient ships available to meet the need. The move is meant to boost the delivery of much-needed relief supplies after Hurricane Maria battered the US territory last week.
Delivering supplies throughout the island is still a challenge, and Puerto Rico's infrastructure remains severely damaged.
"The situation on the island is perilous and reporting on the sustained damage and dangers is hard at best", Esri Industry Manager Ryan Lanclos said in a statement. The agency quoted a spokesman for a Florida-based shipping company as saying thousands of 20-foot containers of food, water and soap were piling up at docks in the Puerto Rican capital, San Juan.
Under the law, only USA -flagged ships are allowed to move goods between any US ports.
BYU adds caffeinated soft drinks for first time since 1950s
Many in the Church of Jesus Christ of Latter-day Saints, of which Brigham Young is a part, avoid all caffeine. The university consistently resisted calls for a caffeinated campus, insisting its consumers did not want it.
"Now Congress must repeal this law to aid long-term recovery", McCain wrote.
Juana Matos resident Hector Rosa walks through a flooded area after the passing of Hurricane Maria, in Puerto Rico, Wednesday, September 27, 2017.
He says President Donald Trump has waived a matching funds requirement, which means the cash-strapped island won't have to contribute to the initial costs of the federal assistance.
They have also pointed out that the US Virgin Islands, which have also been hit hard by the hurricanes which have battered the Caribbean in recent months, was given a permanent waiver in the original act.
Military personnel are playing a sizeable role. Large numbers of generators are now on Island. Five of six priority sea ports were open, although some had restrictions on the size of the vessel or were for daylight use only, the Pentagon said. "You have to remember that not only did Irma come through and create quite a bit of damage and destruction that we were working to fix, but Maria was. one of the strongest storms that Puerto Rico's seen since the 20's and let's face it, the infrastructure is weak and there were no building codes and so there is a lot of devastation and we understand that".
Image copyright Getty Images How bad is the situation on Puerto Rico?