Sens. Cory Booker Cory Anthony Booker3 reasons why Biden is misreading the politics of court packing Bipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility MORE (D-N.J.), Bernie Sanders Bernie SandersThe Hill's Campaign Report: Trump faces backlash after not committing to peaceful transition of power Bernie Sanders: 'This is an election between Donald Trump and democracy' The Hill's 12:30 Report: Trump stokes fears over November election outcome MORE (I-Vt.) and Elizabeth Warren Elizabeth WarrenHillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Democratic senators ask inspector general to investigate IRS use of location tracking service MORE (D-Mass.), all 2020 White House hopefuls, are urging officials to review Sinclair Broadcast Group's acquisition of 21 regional sports networks, saying the media conglomerate relays "partisan political messages" to viewers.

“It is clear that Sinclair has an explicit interest in, and commitment to, relaying partisan political messages to its viewers — making its recent anti competitive expansion attempts into millions of additional households all the more concerning,” they wrote in a letter to the Federal Communications Commission (FCC) and Department of Justice.

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“The RSNs [regional sports networks] Sinclair purchased from Disney — collectively ‘the largest group of commonly controlled RSNs’ — reach approximately 74 million subscribers across the country and have the rights to telecast the games of almost half of all the professional sports teams in three of the four major American sports leagues,” their letter continues.

The senators warn that Sinclair “could market to distributors combinations of sports and local television channels that they have to offer to consumers as a bundle package" with the $10.6 billion acquisition.

“Distributors understand the value of live sports and the limited number of un-bundled live sport streaming options available to consumers leave ‘sports fans ... tethered to their cable bundle,’ ” they added. “Therefore, the agreement with Disney offers Sinclair an opportunity to charge consumers more by packaging their cable and broadcast programs.”

The accusation and review request comes one year after a Sinclair-Tribune Company merger collapsed after the FCC rejected it, citing "serious concerns" regarding side transactions Sinclair had proposed to meet media ownership restrictions. The deal would have allowed Sinclair to be in almost three-quarters of U.S. homes.

Sinclair has several conservative commentators on its roster, including former Trump 2016 campaign senior adviser Boris Epshteyn, former Trump deputy adviser Sebastian Gorka Sebastian Lukacs GorkaSunday shows preview: Trump, lawmakers weigh in on COVID-19, masks and school reopenings amid virus surge Trump taps Gorka for national security advisory board Sunday shows preview: Coronavirus poses questions about school safety; Trump commutes Roger Stone sentence MORE, and Blaze Media host Eric Bolling.

The Maryland-based Sinclair was founded in 1971. It currently is in 39 percent of American homes.