Seven Democratic senators have asked the Federal Emergency Management Agency to authorize full reconstruction aid to Puerto Rico, which the island's government requested two weeks ago.

Chuck Schumer, D-NY, Kirsten Gillibrand, D-NY, and five other Democratic senators sent a letter to FEMA administrator Brock Long on Friday, urging the agency to approve funding for Puerto Rico to rebuild roads, fix the electric grid and repair other damaged infrastructure.

"Permanent Work funding from FEMA is the main source of federal assistance to help a community repair and rebuild its public infrastructure after a natural disaster, and there should be absolutely no ambiguity that the federal government intends to provide this crucial assistance to help Puerto Rico build back after Hurricane Maria," they wrote.

It's unclear why FEMA hasn't yet authorized what is known as C-G public assistance. Two weeks ago, a FEMA spokesperson in Puerto Rico told Vox that the island "was well on its way" to getting this aid, though he didn't say how soon. FEMA approved this type of reconstruction aid for the US Virgin Islands two weeks after Maria hit; and it was approved for Texas ten days after Harvey.

Yet the situation in Puerto Rico is far worse: About 87 percent of the island still doesn't have power, less than half of cellphone towers are working, and about 28 percent of the territory still doesn't have running water.

President Trump could speed up the process if he cared to. The Stafford Act, which gives FEMA authority to carry out emergency missions, also gives the president broad discretion in guiding the agency's efforts: The president “may provide accelerated federal assistance and federal support where necessary to save lives, prevent human suffering, or mitigate severe damage” even without “a specific request.”

If Trump wanted to, in other words, he could fast-track FEMA's response in Puerto Rico. Instead, he has repeatedly suggested that Puerto Rico does not deserve the same level of disaster response that the federal government is giving to others:

...We cannot keep FEMA, the Military & the First Responders, who have been amazing (under the most difficult circumstances) in P.R. forever! — Donald J. Trump (@realDonaldTrump) October 12, 2017

Funding infrastructure repairs is part of FEMA's mission

After the president declares a major disaster zone at a governor's request, FEMA generally provides initial emergency help for local governments and individuals. This is known as A-B public assistance. The idea is that a natural disaster caused so much damage that state and local governments are not equipped to help people on their own.

This is the kind of assistance that Florida, Texas, Puerto Rico, and the US Virgin Islands all got within a day or so after recent hurricanes. Emergency responders from multiple federal agencies and nonprofits are deployed to the area to rescue disaster victims and meet their basic needs: food, water, shelter, and medical care. Part of the aid involves getting critical infrastructure to operate.

There are also extended categories of help known as C-G assistance. Unlike the initial emergency response, this level of help is more about reconstruction. FEMA provides grants to local governments to rebuild damaged infrastructure at a reasonable cost. Local governments can then hire contractors and utility crews to fix schools, sewage plants, government offices, etc. The federal government will pay at least 75 percent of the cost, but the president could decide to cover it all. After Hurricane Katrina, FEMA spent $9.9 billion rebuilding the New Orleans area as part of this program.

Puerto Rico needs this kind of help right away.

Fixing damaged infrastructure has been an insurmountable challenge for responders in Puerto Rico. The hurricane completely wiped out the island's cellphone towers and electrical grid, so it's been immensely hard for emergency responders to provide basic help. They have struggled to contact remote towns, and many roads are still impassable. It took days to open shipping ports and the international airport.

A few days after the storm, a Department of Energy responder told Vox that damage to the electrical grid would cost billions of dollars to repair, with nearly 80 percent of transmission lines down and 100 percent of the wires connecting homes and businesses wrecked. "We cannot do this whole thing on our own," he told me at the time.

Restoring power, communications, and running water isn’t the kind of work that emergency responders can do. Puerto Rico needs utility crews and government contractors from the US mainland. So far, that's not happening, and it won't until FEMA authorizes the C-G categories.

Texas and the US Virgin Islands are already getting this aid

On September 4, 10 days after Harvey flooded the Texas coast, FEMA authorized the category C-G response for 27 counties in the state, including the Houston area. A few days later, it agreed to fund 90 percent of those costs, instead of the standard 75 percent. The current rebuilding efforts includes restoring city parks, public buildings, roads, and bridges that were damaged by the excessive rain and flooding in the area.

On Oct 5th, two weeks after Maria hit Puerto Rico and the US Virgin Islands, FEMA authorized this level of help for the US Virgin Islands.

On Wednesday it will be a month since Maria devastated Puerto Rico, and FEMA has yet to authorize the same level of response for the territory of 3.4 million US citizens. President Trump doesn't seem inclined to do more for the island, possibly because of the enormous cost: There are no official damage estimates yet, but fixing the electric grid alone will cost billions of dollars, according to the Department of Energy.

Puerto Rico is in no position to rebuild on its own. The island's government is broke, and declared a form of bankruptcy in May. Puerto Rico can no longer borrow money and will probably need the US government to pay most of its reconstruction costs.

Under the Stafford Act, the president could decide to do just that:

In any major disaster, the president may direct any Federal agency, with or without reimbursement, to utilize its authorities and the resources granted to it under Federal law (including personnel, equipment, supplies, facilities, and managerial, technical, and advisory services) in support of State and local assistance response and recovery efforts.

Yet the president is not inclined to help Puerto Rico. Trump has repeatedly pointed to the fiscal crisis on the island as the root of the problem, and has painted Puerto Ricans as lazy people who want the government to do everything.

...Such poor leadership ability by the Mayor of San Juan, and others in Puerto Rico, who are not able to get their workers to help. They.... — Donald J. Trump (@realDonaldTrump) September 30, 2017

...want everything to be done for them when it should be a community effort. 10,000 Federal workers now on Island doing a fantastic job. — Donald J. Trump (@realDonaldTrump) September 30, 2017

Under the law, FEMA is supposed to treat Puerto Rico like a US state. Instead, Trump and the agency are leaving the island to struggle on its own.