A group of liberal lawmakers, including Sens. Bernie SandersBernard (Bernie) SandersFive takeaways from Cruz, O'Rourke's fiery first debate Ben & Jerry’s co-founders announce effort to help 7 Dem House challengers Dems look to Gillum, Abrams for pathway to victory in tough states MORE (I-Vt.) and Elizabeth WarrenElizabeth Ann WarrenDemocrats opposed to Pelosi lack challenger to topple her More Massachusetts Voters Prefer Deval Patrick for President than Elizabeth Warren Trump's trade war — firing all cannons or closing the portholes? MORE (D-Mass.), want the administration to dig into the "ridiculous prices" they say Americans are paying for cable and the Internet. 

The two, joined by Sens. Ed MarkeyEdward (Ed) John MarkeyOvernight Defense: Mattis dismisses talk he may be leaving | Polish president floats 'Fort Trump' | Dem bill would ban low-yield nukes Dems introduce bill to ban low-yield nukes Some employees' personal data revealed in State Department email breach: report MORE (D-Mass) and Al FrankenAlan (Al) Stuart FrankenNelson campaign to donate K from Al Franken group to charity Sexual assault is not a game — stop using women to score political points Election Countdown: Trump confident about midterms in Hill.TV interview | Kavanaugh controversy tests candidates | Sanders, Warren ponder if both can run | Super PACs spending big | Two states open general election voting Friday | Latest Senate polls MORE (D-Minn.), sent a letter to Federal Communications Commission Chairman Tom Wheeler suggesting that because of limited options for consumers companies are able "to charge ridiculous prices and add hidden fees."

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“Many Americans have very few, if any, options when it comes to choosing their local cable and Internet provides," the senators said in a letter that was sent Thursday, but released on Friday. "As the telecommunications industry has become increasingly concentrated, this lack of choice has resulted in huge price increases and often poor services for customers." 

The senators said Wheeler's agency is required to keep track of how much consumers pay and want him to hand over the information, including how much consumers pay for cable and Internet on average by state and by company, as well as how much rural Americans pay versus urban Americans. 

The letter comes as the agency this week announced its review team for the proposed merger of Charter, Time-Warner Cable and Bright House Networks. If the merger is successful, the FCC says it will represent the second-largest broadband Internet provider in the country and the third-largest cable provider. 

The senators pointed to the merger as a reason to put "urgency" behind their request, adding that with increasing mergers "there are now de facto telecommunications monopolies throughout the United States." 

Sanders, who is running for the Democratic presidential nomination, said in a separate statement that “Americans deserve affordable access to the Internet, not hidden fees and rising prices," adding that he hopes Wheeler "will take action and continue to defend American consumers.”

The FCC declined to comment on the letter.

The issue of the FCC’s authority over Internet pricing is contentious. The business community and conservative lawmakers have said they think that the commission’s new net neutrality rules open the door to rate regulation. They say that by regulating broadband providers like utilities, the FCC can now seek approval over how much companies charge consumers for Internet access.

Wheeler has insisted that won’t be the case.

"Broadband providers will be able to adjust retail rates without Commission approval and without having to wait even a minute," the FCC said in a fact sheet about the net neutrality order.

— David McCabe contributed. This story was updated at 11:53 a.m.