Turns out, Mayweather's been friends with Trump for a while -- and says he really appreciated the support he got from Donald during the Manny Pacquiao fight.
Mayweather wouldn't say if he's a democrat or a republican -- but praised both Obama and Trump.
"Barack Obama was a good president and hopefully, Donald Trump is a good president."
Mayweather also has a message for people concerned about Trump's presidency -- "We don't know what can happen in life. Only thing we can do is keep our fingers crossed, pray and hope for the best."