The move could transform how 70 million workers build wealth for retirement.

The Financial Times first reported that Trump will direct federal agencies to remove barriers preventing 401(k) plans from including cryptocurrencies and other alternative investments. Three sources familiar with the plans confirmed the executive order could be signed as early as this week.

The decision affects the massive U.S. retirement system. Americans currently hold $8.9 trillion in 401(k) plans across more than 715,000 workplace programs, according to the Investment Company Institute. Right now, most workers can only invest their retirement money in traditional stock and bond mutual funds.