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Ramaswamy is running against Trump because he believes that while Trump has done some good things for the country, such as decreasing regulations and taxes, he has also implemented policies that threaten the environment, civil liberties, and immigrant rights. He believes that it is important to be a voice for these issues in the White House. Additionally, he believes that America needs unity and good leadership to move forward, and he wants to bring his ideas and leadership skills to the table.