No, Donald Trump, migrants aren’t ‘killing’ Social Security and Medicare - The Washington Post

In 2013, the chief actuary for Social Security estimated that about half of undocumented immigrants used a Social Security number. As a result, undocumented immigrants and their employers paid $13 billion in Social Security taxes in 2010, the actuary said. 

The Center for Immigration Studies, which supports stricter immigration limits and a merit-based immigration system (and is often quoted with favor by Trump), said in a report last year that payments by undocumented immigrants "improves the finances of Social Security and Medicare." …

https://www.washingtonpost.com/politics/2024/03/26/no-donald-trump-migrants-arent-killing-social-security-medicare/