One of the Obama administration’s final major labor regulations could deprive millions of retirement savers investment advice from financial professionals, according to a new report.

The Department of Labor proposed the Fiduciary Rule in April 2015, which would allow regulators to oversee the relationship between retirement account advisors and their clients to ensure that the former were completing trades for the sole interest of their clients. The rule was approved in 2016 under the leadership of Labor Secretary Tom Perez, now the head of the Democratic Party.

“In 2016, the Department took a historic step to protect the savings of America’s workers—the conflict of interest rule makes sure that professionals providing retirement investment advice have to give advice that’s in the best interest of their clients and not divert their clients’ hard-earned income into their own pockets through hidden fees and conflicted advice,” Perez said in an exit memo published on the White House website.

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