White said security issues play a part in the reasons why the POTUS wouldn't attend the fight.
"He looks good for a seven- or eight-figure fighter, but I'm a nine-figure fighter", Mayweather said.
"My game is close but then it's hard to sit up here and stand in front of a camera every single time and say to you guys it's close, because I sound a bit of a broken record after a few weeks", he said.
McGregor's comments may be a reference to Mayweather's alleged troubles with the United States tax authorities.
Mayweather told the 20,000-strong crowd: "I don't care if it's a ring or it's an octagon, I will kick ass".
The profane insults and the posturing that normally can be enjoyed only in your better prison exercise yards are bound to be more entertaining than the August 26 fight itself.
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A costly pin-stripe suit on first reflection actually had the words "F*** You" sewn in over and over in a classic insult to Mayweather, whom he accused of being "f***ed" as he could'nt afford a suit himself anymore. I'm not the same fighter I was ten years ago [.] five years ago [.] two years ago - but I've got enough to beat you.
The 40-year-old Mayweather has been coaxed out of his latest retirement for the colossal payday coming from this unique matchup.
On Monday, it was revealed that the pay-per-view event would cost $89.95 for standard definition and $99.95 for high definition.
Floyd Mayweather and Conor McGregor came face-to-face in Los Angeles for the first time yesterday as promotion for the eagerly anticipated bout got underway between the two. "The Rolls is a 2012 outside".
But is he attending the event at the T-Mobile Arena in Las Vegas on the D-Day?
Although he was later to the venue, McGregor did arrive on stage before Mayweather however - and UFC president Dana White had an impassioned introduction waiting for him.
The lien for 2015 is just the latest in a series of tax liens filed by the IRS against Mayweather over the past decade.