Democratic presidential front-runner 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 had trouble getting through a turnstile at a subway station in New York City on Thursday.

Footage from CNN showed the former New York senator struggling to scan a subway card during a campaign visit to the city.

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Her 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, has also had his struggles with the Big Apple's transit system. In an interview with the New York Daily News this week, he incorrectly suggested that riders need “tokens” to access the subway.

Just before Clinton got on the subway on Thursday, she took a jab at the Vermont senator over the comment.

“I think it was my first term [as senator] when we changed from tokens to MetroCards,” she said to reporters, according to AM New York.