SS, medicare spending. You are correct, neither party wants to address it.
2016
Medicare 685 billion
SS 905 billion
2017
medicare 702 billion
ss 1000 billion .
2016 total was 1.590 trillion dollars. 1.7 trillion 2017. 7% increase.
https://www.cnsnews.com/news/article/terence-p-jeffrey/social-security-administration-spending-tops-1-trillion-first-time
https://www.hhs.gov/about/budget/budget-in-brief/cms/medicare/index.html