WASHINGTON (AP) — Congress edged closer to delivering relief to debt-stricken Puerto Rico as the Senate on Wednesday cleared the way for passage of a last-minute financial rescue package for the territory of 3.5 million Americans.

Puerto Rico is in a decade-long recession and has $70 billion in debt. A $2 billion payment to creditors is due Friday. Thousands have fled the island and moved to the U.S. mainland as businesses have closed, schools have struggled with limited electricity and hospitals have asked for cash payment in advance for some medication.

The White House and Republican and Democratic leaders in Congress have warned that without help from Washington, Puerto Rico will descend into economic chaos, with signs already pointing to a humanitarian crisis.

On Wednesday, the Senate voted 68-32 to move forward on a rescue package that would create a control board to oversee the U.S. territory's finances and supervise some debt restructuring. The legislation would not provide any direct financial aid to the territory, but leaders warned that a bailout could eventually become necessary if Congress doesn't take this step.

"If we don't act before the island misses a critical debt payment deadline this Friday, matters will only get worse — for Puerto Rico and for taxpayers," said Senate Majority Leader Mitch McConnell, R-Ky.

A final vote could come as soon as Wednesday, if opponents of the measure agree to allow a vote quickly. The House passed the bill earlier this month, so Senate passage would send the bill to President Barack Obama for his signature.

The control board would be similar to one that oversaw the District of Columbia in the late 1990s. Its seven members would oversee negotiations with creditors and the courts over reducing some debt.

In addition to creating the board, the bill would require the territory to create a fiscal plan and fund public pensions, which the Puerto Rico government has shorted by more than $40 billion.

Treasury Secretary Jacob Lew visited Capitol Hill on Tuesday in a bid to persuade some reluctant Democrats concerned that the board would be too powerful. Democrats have also opposed a provision that would allow the island's government to lower the minimum wage for some younger workers.

Lew urged senators to vote for the bill even though it isn't perfect, saying that if the island defaults, the government may be forced to shut public transit, close a hospital or send police officers home.

He and other supporters warned that if the measure fails to pass before the July 1 payment deadline, the island will face multiple lawsuits from unpaid creditors and could be forced to cut essential services further. The legislation would block creditor lawsuits.

In a rare case of bipartisanship in an election year, the package had the support of Obama and top Republican and Democratic leaders in the House and Senate.

"This economic crisis is a humanitarian disaster," said Senate Minority Leader Harry Reid, D-Nev., who backed the bill despite frustration that Democrats were blocked from making changes. "Medical services have diminished. Hospitals are unable to pay their bills. Puerto Rico's largest hospital has closed two of its wings, reduced the number of beds by nearly 25 percent, and cut pay for all employees."

Some Democrats backed the bill unenthusiastically.

"I'm not going to let the adequate be the enemy of the barely sufficient," said Oregon Sen. Ron Wyden, top Democrat on the Senate Finance Committee.

Others voted against it. Democratic Sen. Bob Menendez of New Jersey monopolized the Senate floor for more than four hours Tuesday evening, arguing that the bill adopts a colonial approach over the territory's 3.5 million U.S. citizens. He said ordinary Puerto Ricans would have little say over the control board and the package favors hedge-fund creditors over island pensioners.

Sen. Bernie Sanders, I-Vt., opposed the legislation for similar reasons, calling it "disastrous."

Republicans were split. Some said the control board wouldn't be powerful enough. Others said it was the best path forward.

"We're not going to let Puerto Rico go off a cliff here, it's too important," said Florida Sen. Marco Rubio.

The legislation is needed because Puerto Rico cannot declare bankruptcy under federal law. Mainland municipalities and their utilities can, while municipalities and utilities in Puerto Rico cannot.

In the days before the vote, some bondholder groups worked to turn senators against the bill, arguing it doesn't sufficiently protect creditors and is tantamount to a bailout for the territory. Several labor unions also lobbied against the measure, arguing that a lower minimum wage could take money out of the Puerto Rican economy.

Like Lew, Puerto Rican Gov. Alejandro Garcia Padilla made an 11th-hour visit to Capitol Hill to lobby for votes.

"It's not perfect, but we need it," Garcia said Tuesday.