UFC star Conor McGregor argued on Wednesday that fighters should stop promising to bet their pay on whether they win their match and instead should keep their money.

"Has any competing fighters bet their purse against each other and then followed thru? We should stop doing this. Fighting is tough. It can go anyway. Luck plays a hell of a part. Don’t be saying you are betting your fight purse against each other. Because it never happens. And it’s stupid. Train hard. Fight hard. Earn your dough. And then enjoy it. God bless," McGregor tweeted.

When encouraged by a fan to bet his fight check on the outcome of his upcoming match against UFC lightweight Michael Chandler, the first-ever UFC two-weight world champion declined.

"I make substantially more than everyone on the roster combined so it’s not feasible. I could bet a portion however. But it’s ridiculous, and no. This game, and the longer you are in it, gets tougher and tougher. I’m keeping my hard earned money for my loved ones," he wrote.

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McGregor's comments came amid an ongoing debate over fighter pay in mixed martial arts and just one day after boxing stars Ryan Garcia and Gervonta Davis agreed to bet each of their paychecks for their April 22 championship fight on the bout's outcome.

UFC president Dana White argued that the company's athletes are paid fairly and proportionately to the money that they bring in. 

"If you don't like it, there's a simple solution to this problem," White told GQ last summer. 

"Go start your own MMA organization - no barrier to entry. Knock yourself out. Pay (fighters) whatever you want to pay them. It's been done before. How's it worked out for other guys? Not well," he continued.

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Former UFC heavyweight champion Francis Ngannou left the organization earlier this year in protest despite being offered the highest paying contract in heavyweight history over what he argued is unfair treatment of less established fighters. He contended that the UFC should provide its fighters, who are technically independent contractors, with healthcare and other benefits.

McGregor has generally refrained from criticizing the UFC over this issue and criticized Ngannou's decision to leave during a recent appearance on MMA journalist Ariel Helwani's show.

McGregor recently appeared on Fox News' "Hannity", where he donated $1 million to the Tunnel to Towers Foundation. He is a coach on the UFC's upcoming season of "The Ultimate Fighter" reality series and is expected to make his return to the octagon later this year.

Two families in Arizona have filed a lawsuit challenging a state law that bans transgender girls from participating in school sports, with one parent citing concern for their child’s "self-esteem" and "confidence."

The lawsuit filed in the U.S. District Court in Tucson challenges Senate Bill 1165, which restricts participation in school sports based on a biological sex. 

The identities of the two plaintiffs in the case, an 11-year-old and 15-year-old, have been concealed out of fear for their safety. Their names are listed as Jane Doe and Megan Roe, respectively. 

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"Jane will be very upset if she is not allowed to play sports on a girls’ team. Jane knows this would be because she is transgender, and I worry about how that will affect her self-esteem and her confidence," the mother Jane Doe said via a statement provided by the National Center for Lesbian Rights (NCLR), which is representing the plaintiffs in the case.

"Jane will not receive all the positive benefits that school sports provide. This includes the obvious physical benefits, but also social and emotional benefits of playing with other kids, learning how to win and lose, and having coaches and other adults who support the team."

"No parent ever wants their kid to lose out on opportunities and experiences that can help them grow as people," the mother of Megan Roe added. "Sports provide all kinds of benefits to kids, and it is very upsetting that they may be completely cut off for my child." 

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Attorneys in the case have also argued the law violates the Equal Protection Clause under the U.S. Constitution and Title IX.

State Superintendent of Public Instruction Tom Horne was named a defendant in the case. He called the lawsuit's logic "backwards."

"Title IX was aimed at giving girls equal opportunities for playing sports. When a biological boy plays in a girls’ sport, it disadvantages the girls," Horne told The Associated Press. "There have been lots of news stories about girls who worked hard to excel at their sports, found they could not when they had to compete against biological boys and were devastated by that."

The lawsuit also names the Arizona Interscholastic Association, the Kyrene School District in Tempe and The Gregory School in Tucson as defendants in the case. 

The lawsuit follows the Biden administration’s plan to release new Title IX rules that would bar states from banning transgender students from competing against the gender they identify as.

The Associated Press contributed to this report.