Senate Minority Leader Charles Schumer Chuck SchumerPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' 3 reasons why Biden is misreading the politics of court packing Cruz blocks amended resolution honoring Ginsburg over language about her dying wish MORE (D-N.Y.) and Sen. Tom Cotton Tom Bryant CottonThe Hill's 12:30 Report: Trump stokes fears over November election outcome The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Abortion stirs GOP tensions in Supreme Court fight MORE (R-Ark.) on Thursday asked U.S. intelligence officials to assess whether Chinese-owned social media platform TikTok poses "national security risks.”

"Security experts have voiced concerns that China’s vague patchwork of intelligence, national security, and cybersecurity laws compel Chinese companies to support and cooperate with intelligence work controlled by the Chinese Communist Party," the lawmakers wrote in a letter to acting Director of National Intelligence Joseph Maguire Joseph MaguireCongressional Democrats request FBI briefing on foreign election interference efforts Wells Fargo told employees to delete TikTok from work phones Hillicon Valley: Pompeo floats TikTok ban | Civil rights groups slam Facebook after call | Election security funding included in proposal MORE.

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"Given these concerns, we ask that the Intelligence Community conduct an assessment of the national security risks posed by TikTok and other China-based content platforms operating in the U.S. and brief Congress on these findings."

The senators also raised concerns that TikTok may be adhering to Chinese censorship rules to limit what users can see, including content related to pro-democracy protests in Hong Kong and the treatment of the minority Uighur population.

Schumer and Cotton also raised concerns that TikTok could be a “potential target of foreign influence campaigns like those carried out during the 2016 election on U.S.-based social media platforms."

The issues raised in the letter come amid government-wide unease with influential Chinese firms over concerns that Beijing may have access to sensitive information.

A spokesperson for TikTok told The Hill that it is reviewing the letter.

"We will not be offering any further comment on it at this time other than to reaffirm that TikTok is committed to being a trusted and responsible corporate citizen in the US, which includes working with Congress and all relevant regulatory agencies," they said.

TikTok, which hosts short-form videos often set to music, was downloaded 663 million times in 2018. Its growing popularity has brought increased scrutiny from American lawmakers and regulators.

Sen. Marco Rubio Marco Antonio RubioGOP lawmakers distance themselves from Trump comments on transfer of power McConnell pushes back on Trump: 'There will be an orderly transition' Graham vows GOP will accept election results after Trump comments MORE (R-Fla.) earlier this month urged regulators to investigate the acquisition of social video platform Music.ly by ByteDance, TikTok's parent company.

Open Markets Institute, an antitrust advocacy organization with close ties to Sen. Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE (D-Mass.), echoed that call on Thursday.

"Furthermore, U.S. authorities should require Bytendance to sell TikTok to non-Chinese owners, or else ban TikTok in the U.S.," Open Markets said in a statement.

"At best, TikTok is a direct source for the Chinese to harvest American user data," they said. "At worst, TikTok is an opportunity for the Chinese Communist Party to use algorithms to manipulate Americans to push an authoritarian agenda."

ByteDance bolstered its team in response to the new attention this month with the addition of former Reps. Jeff Denham Jeffrey (Jeff) John DenhamBottom line Bottom line Lobbying world MORE (R-Calif.) and Bart Gordon (D-Tenn.), who will help develop content moderation policies.

In June, ByteDance registered to lobby in the U.S., putting "general issues affecting internet companies" as one of its priorities.

It also hired American law firm Covington & Burling in July to provide advice on tech policy issues.

—Updated at 3:41 p.m.