Defense budget is obese. Would be the logical first choice.
You don't have to have a first choice. Cut everything, defense included.
Isn't that what Obama did with sequestration?
The great sequestration "cuts" only slightly reduced the rate of growth in spending. That's not an actual cut.
As for Obama's hand in the sequestration - he offered it as a poison pill. His strategy was to force the GOP to accept a package of tax increases and spending cuts by presenting the sequester as the only alternative. He assumed the GOP would never accept the sequester, but they did.
So way to go Obama for stumbling bassackwards into temporarily reducing the rate of spending growth...
But it's still increasing. And we're still averaging nearly trillion dollar annual deficits.