As some have pointed out, it's to prop up his image domestically. Also, he's probably trying to squeeze concessions out of Biden by bluffing going into Ukraine.

(Apologies. I thought this was a still from the set and have since seen it in the trailer. They could possibly still color correct later, but the fact they didn’t is worth the complaints.)

<shrug> Why does it matter? The performance will either be good or it won't, and we won't know that until it is released.

I'm guessing whatever this is will be recolored in post, so what's the drama?