[Robert DeLong]

Huh? How do you get that translation? Or are you offering a liberal translation?

[BradyLS]

I'm guessing Trump offered MLK III his to shake. Why otherwise would he have it out? Shaking hands his a stronger gesture between two people than just "thumbs up." For whatever reason, the offer wasn't picked up. Rather than look awkward with his hand out, Trump gives a "thumbs up."