I didn't see him leave an Emoji. Ali made a Trump campaign post, and Kamaru commented "Haters gonna hate. We're just gonna worry about us."
As far as his reasoning, only Usman knows his rationale for attending a Trump campaign rally in this climate. Like I said in another post, I believe Kamaru is more supporting Ali as a friend and manager more than anything else. You mentioned "your president" so I assume you're not in America. I don't know what gets reported worldwide, but the vibe on the ground out here is real neo-Nazi-ish and Confederate with Trump's base, and they're not hiding it anymore. It's bigger than Trump just being an idiot.
So if you're right and it's all just a mind game, it's still a horrible look for Kamaru to show up at his rallies and be used as a point in his speech. I'm a Kamaru fan, so I'm not trying to tell you how you feel, but this shyt is a horrible look in my opinion.