As millions of Americans file their 2021 income taxes online today, Sen. Elizabeth Warren (D-MA) is demanding answers from Intuit about its popular TurboTax e-filing product.

In a letter to Intuit CEO Sasan K. Goodarzi, Warren says the company has used “extensive lobbying and adroit influence peddling” to prevent Americans from filing their taxes for free online.

The Federal Trade Commission (FTC) filed suit against Intuit in March for deceptive marketing, an action Warren calls “both welcome and long overdue.” Reps. Brad Sherman (D-CA) and Katie Porter (D-CA) also signed onto the letter.

Many of Warren’s complaints center on the Free File program, an IRS partnership with a nonprofit coalition of tax prep companies founded in 2003 to provide free tax services to low-income filers.

Under the terms of the partnership, 2021 filers with an adjusted gross income of $73,000 or less are eligible for the services, which are listed on the IRS website.

Intuit’s participation in the program came under criticism after a series of ProPublica reports showed that both Intuit and H&R Block had misled Free File-eligible filers into paying to file their taxes.

The companies also deliberately made the free versions of their software difficult to find in online search results, according to ProPublica. Intuit left the Free File program in 2021.

In the letter to Goodarzi, Sen. Warren writes that “the Free File program has been a failure, scamming taxpayers into paying for services that should be free,