"And yet, there are still people in American politics who, for some reason, cling to this belief that America is better off adopting the economic policies of nations whose people who immigrate here from there"

This quote by Marco Rubio is a commentary on the current state of American politics. He is explaining that there are still people in American politics who think that the financial policies of other nations should be adopted in the United States. He suggests that this belief is misdirected, as individuals who immigrate to the United States are doing so due to the fact that they believe that the economic policies of the United States are much better than those of their house countries. He is recommending that the United States ought to continue to pursue its own financial policies, rather than embracing those of other countries, as this is what has made the United States a desirable destination for immigrants. He is also indicating that the United States need to not be afraid to innovate and create its own financial policies, as this is what has actually made it an effective nation.