(Bloomberg) -- U.S. Treasury Secretary Jacob J. Lew said a failure by Congress to help Puerto Rico resolve its debts may hit the retirement portfolios of average Americans, as he stepped up his call for lawmakers to help the island.

Lew endorsed legislation granting the commonwealth access to an orderly bankruptcy regime that’s needed to prevent a chaotic and protracted resolution of Puerto Rico’s financial troubles, an event he said would be costly both for the island and the U.S.

“The continued deterioration of Puerto Rico’s economic and financial conditions has the potential to further harm retiree investment portfolios across the country,” Lew said in a letter to Republican Senator Orrin Hatch released Tuesday. “A significant portion of Puerto Rico’s debt is still held directly by individual retail investors or indirectly through the municipal bond funds they own.”

Junk-rated Puerto Rico and its agencies have racked up more debt than any state except California and New York as the government borrowed to paper over budget deficits.

Last month, Governor Alejandro Garcia Padilla said the commonwealth couldn’t pay all of its obligations. His administration will draft a debt-restructuring plan by Sept. 1.

Lew’s statement comes as Congress prepares to take off for summer recess and as the chances of default are rising. On Aug. 1, $36.3 million of bonds sold by Puerto Rico’s Public Finance Corp. become due. The island’s legislature hasn’t appropriated the funds to settle that payment.

Bills to allow some commonwealth agencies to file for Chapter 9 bankruptcy, introduced in both chambers, haven’t advanced so far due to lack of support from Republican leaders.

Lew also reiterated that Puerto Rico needs “a long-term comprehensive fiscal plan” that should include input from a range of stakeholders and “have credible assumptions for long- run revenue collections, expense outlays, and growth.”

About 52 percent of U.S. mutual funds that focus on municipal debt hold Puerto Rico securities, according to Morningstar Inc.

--With assistance from Michelle Kaske in New York.

Copyright 2018 Bloomberg. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

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