Democratic presidential front-runner Hillary ClintonHillary Diane Rodham ClintonDe Blasio pitches himself as tough New Yorker who can take on 'Don the con' From dive bars to steakhouses: How Iowa caucus staffers blow off steam Warren policy ideas show signs of paying off 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 SandersBernie SandersButtigieg defends appearing on Fox News: Many Americans don't hear Dems' message Buttigieg: The future 'is personal' for me Donald Trump, president for life? We need term limits now 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.