A group of Senate Democrats is asking regulators to investigate the potential effects of a merger between T-Mobile and Sprint, a deal that is reportedly in the works.

In letters to the Department of Justice and the Federal Communications Commission on Friday, the eight senators, led by Sen. Amy Klobuchar Amy KlobucharThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill EPA delivers win for ethanol industry angered by waivers to refiners It's time for newspapers to stop endorsing presidential candidates MORE (D-Minn.), said they are concerned that the potential deal could hurt consumers.

“Beginning an investigation into a merger of T-Mobile and Sprint now will allow your agencies to quickly, but fully, review the agreement if it is announced,” they wrote.

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“Indeed, multiple news sources are reporting that the two parties are close to a deal in principle. The likelihood of the transaction occurring combined with the serious issues that it raises provide compelling reason for DOJ and the FCC to begin investigating the potential transaction.”

The letter was also signed by Sens. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (Minn.), Patrick Leahy Patrick Joseph LeahyBattle over timing complicates Democratic shutdown strategy Hillicon Valley: Russia 'amplifying' concerns around mail-in voting to undermine election | Facebook and Twitter take steps to limit Trump remarks on voting | Facebook to block political ads ahead of election Top Democrats press Trump to sanction Russian individuals over 2020 election interference efforts MORE (Vt.), Richard Blumenthal (Conn.), Ron Wyden Ronald (Ron) Lee WydenGOP senator blocks Schumer resolution aimed at Biden probe as tensions run high Republican Senators raise concerns over Oracle-TikTok deal Hillicon Valley: TikTok, Oracle seek Trump's approval as clock winds down | Hackers arrested for allegedly defacing U.S. websites after death of Iranian general | 400K people register to vote on Snapchat MORE (Ore.), Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (N.Y.), Ed Markey Edward (Ed) John MarkeySchumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Democrats see fundraising spike following Ginsburg death Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy MORE (Mass), and Jeff Merkley Jeffrey (Jeff) Alan MerkleyThe Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump, Biden renew push for Latino support Sunday shows - Trump team defends coronavirus response Oregon senator says Trump's blame on 'forest management' for wildfires is 'just a big and devastating lie' MORE (Ore.).

Reuters reported last month that the companies could announce a deal by the end of October.

The merger would reduce the number of major national wireless carriers from four to three, and critics argue that such a consolidated market would lead to less competition and possibly higher prices for consumers.

The Republican-controlled FCC said in a report last month that despite the consolidation, there is effective competition in the industry.

“An anticompetitive acquisition would increase prices, burdening American consumers, many of whom are struggling to make ends meet, or forcing them to forego their internet connection altogether,” the Democrats wrote on Friday. ”Neither outcome is acceptable.”