I imagine that even the POTUS has some enemies within his own country, most leaders do, don’t they?
Since when are opposing political parties in the US considered enemies in the sense you are discussing? He’s so brainwashed with Alinsky’s Rules for Radicals that he can’t do the job he was elected to do. The President of the United States is supposed to be above this petty partisanship.
As far as real enemies go, that is why there is the Secret Service.