New York City Mayor Bill de Blasio voiced the "concerns and the needs of all New Yorkers" to US president-elect Donald Trump during a meeting on Wednesday, according to dpa. De Blasio, a Democrat, told reporters after the meeting that it was important for the Republican president-elect to hear the voices from "outside the transition bubble" to understand why people were "so deeply concerned." The mayor said he talked to Trump about financial regulation on Wall Street, taxes, immigration, the city's Muslim community and the policing tactic known as stop and frisk, which was pioneered in New York City but was later abandoned because it disproportionately targeted minorities. During his campaign, Trump had promised to extend the practice to the whole country. "I tried to provide perspective on how stop and frisk can create a wedge between police and community when it's used in an unconstitutional manner," de Blasio said. The mayor said that he left the meeting ensuring Trump that he was open to dialogue despite having "very substantial differences." "I reiterated to the president-elect that I would be open-minded as we continued substantive discussions, but I would also be vigilant and I would be swift to react any time an action is taken that would undermine the people of New York City," de Blasio said.