A little help please with some budget numbers...

Someone was trying to tell me that the largest part of the budget goes to welfare programs, not counting SS or Medicare, and that it even overshadows the defense budget. As his "source" he gave me a link to this Jeff Sessions talking point statement that has virtually NO actual data in it.

http://www.budget.senate.gov/republican/public/index.cfm/files/serve/?File_id=34919307-6286-47ab-b114-2fd5bcedfeb5

I've tried googling, but not sure where to find reliable information on how the budget is broken down item by item. The best thing I found was this: http://www.usgovernmentspending.com/federal_budget_pie but it's not a gummint site, so hard to argue too strongly for it.

Any good sources for this type of info? Links please? Thanks!