Lawmakers on Thursday called on Americans to “wake up” to what they say are dangers posed by Chinese-owned and manufactured rail cars and buses, citing cyber and national security concerns.

The latest pushback comes after agreements between two Chinese groups and multiple U.S. cities to build public transit systems, with lawmakers on both sides of the aisle warning that such deals could compromise the security of transportation system data.

“The potential for an adversarial state actor to monitor the movements of American citizens, hack personal or government-issued devices, and collect intelligence on our military is a major security concern,” Sen. John Cornyn John CornynSenate Republicans signal openness to working with Biden Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Republican Senators raise concerns over Oracle-TikTok deal MORE (R-Texas) said at a Senate Banking Committee hearing on threats posed by state-owned and operated transportation services.

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“Allowing American trains and buses to become Trojan horses for these technologies on American soil is unacceptable,” Cornyn added.

Cornyn was one of the sponsors of a bill signed into law in December as part of the 2020 National Defense Authorization Act that bans the use of federal funds to purchase passenger rail cars or buses from state-owned or controlled groups.

However, a clause was included for the law to not take effect for two years, a provision Cornyn opposed.

“Unfortunately, special interests were able to demand a two-year enforcement delay of some of this legislation’s critical components,” Cornyn testified Thursday. “I am here today to ask for your help in ensuring this delay does not turn into a window the Chinese Communist Party and its state-controlled companies can further exploit.”

Two prominent Chinese transportation manufacturers that the law was aimed at are railcar manufacturer China Railway Rolling Stock Corporation (CRRC) and bus and electric battery manufacturer Build Your Dreams (BYD).

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CRRC, which is the largest manufacturer of metro rail cars in the world, is in the process of building rail cars for Los Angeles, Chicago, Boston and Philadelphia. In 2018, New York’s Metropolitan Transit Authority announced that CRRC had won a contest to build new railcars, with CRRC pledging $50 million of its own funds to win the deal.

One exception to the delay on the new law going into effect was the Washington Metropolitan Area Transit Authority (WMATA), which was required to implement the ban once the bill was signed into law. Prior to the law, CRRC was preparing to bid on a contract to build railcars for the D.C. area.

Sen. Sherrod Brown Sherrod Campbell BrownEmboldened Democrats haggle over 2021 agenda 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 (Ohio), the top Democrat on the Senate Banking Committee, pointed to Chinese government subsidies as enabling CRRC to win the contracts through lowballing bids. In Chicago, Brown noted CRRC beat out the next lowest bidder to build railcars by more than $200 million.

“CRRC and BYD are two in a long line of examples of how China cheats its way ... into being a global leader into industry after industry,” Brown said, adding that “Congress still needs to fully assess the risk associated with data of our transportation system being exposed to foreign actors.”

Experts have warned that the railcars and buses are vulnerable to hacking and could be controlled remotely.

“Putting railcars manufactured by a Chinese state-owned firm underneath the Pentagon in Washington, D.C., or near sensitive locations in New York City or anywhere else in America is a horrible idea,” Scott Paul, the president of the Alliance for American Manufacturing, testified to the Senate committee on Thursday.

Concerns around Chinese transit manufacturers' operations in the U.S. stem from a Chinese intelligence law that requires companies to participate in state intelligence work and hand over data and information if requested. Telecom giant Huawei and social media app TikTok have come under similar negative scrutiny as a result.

Marina Popovic, the chief legal counsel and director of human resources at CRRC Sifang America, told The Hill last year that CRRC was using some American-made components in building the railcars, and that once they were delivered to transit authorities, the railcars would be out of the company’s control.

“CRRC is very dedicated and very supportive of the fact that there will be security measures, safety measures and transit agencies will want to be satisfied before they accept a car,” Popovic said.

Committee member Sen. Martha McSally Martha Elizabeth McSallyKelly's lead widens to 10 points in Arizona Senate race: poll Senate Republicans scramble to contain fallout from Woodward bombshell Mark Kelly apologizes for offensive 2018 joke MORE (R-Ariz.) pushed back hard against the two companies on Thursday, and said the testimony of experts and members of Congress should be “required listening” for transit officials.

“I am making a plea to my fellow Americans to state and local bureaucrats, wake up, we are being played by the Chinese Communist Party,” McSally said.