Spanish phrase
Insisto en ~.
Meaning
I insist upon ___.
When to use it
Communicates a firm demand that someone do something. Often used to press a point in informal or firm contexts and usually softened in formal situations.
Example dialogue
No creo que pueda ir mañana.
I don't think I can go tomorrow.
Insisto en que vengas mañana.
I insist upon your coming tomorrow.