I would slash spending in half if I could.
No one is xenophobic. That is a red herring word.
Nationalism used to be a good thing. Not sure why it is a problem now. Nationalism ≠ National Socialism. Teddy Roosevelt, Woodrow Wilson, FDR and Reagan were nationalists. Washington and Lincoln were nationalists.
Isolationism...also not a bad thing as a default, if by that we mean not running around the world sticking our noses in places we have no reasonable business being in. George Washington was an isolationist by that standard. Obviously, it is just a default position, not a rule that cannot be broken.
Protectionism...as I indicated before, I am, by default, against protectionism. But, trying the same thing and expecting different results?...I'm not for that. Might as well give protectionism a shot and see what happens. It may be like the typical liberal solution: short term benefits, long term disaster. We shall see.