Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE may have broken New York Metropolitan Transportation Authority rules when she took a ride on a subway car Thursday.

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MTA rules state no person "shall engage in any nontransit uses" on subway cars, including public speaking and campaigning. Violators could face fines of up to $125 in civil and criminal penalties, as pointed out by a Guardian contributor.

During her ride, Clinton interacted with subway patrons while flanked by security and media.

The MTA rule is in place to prevent performers and musicians, who often legally perform on subway platforms, from carrying their acts into the cars.

Clinton's trip caught attention from the media when she struggled with a subway turnstile, swiping her card multiple times to get through.

Both Clinton and rival Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE are campaigning in New York ahead of the state's April 19 primary.