U.S swimmer Caeleb Dressel has defended Simone Biles's decision to pull out of most of her Olympic events.

Dressel, who entered the Games as a 2-time Olympic gold medalist, told people to leave Biles alone after they criticized her decision to drop out of the Games.

Biles stepped back from the Olympics last week, citing concerns about her mental health, and pulled out midway through the all-around team final after scoring her lowest Olympic vault score in the opening rotation.

She told reporters after her performance that she has "to focus on my mental health."

"Whenever you get in a high-stress situation, you kind of freak out," she said. "I have to focus on my mental health and not jeopardize my health and well-being. It just sucks when you're fighting with your own head."

Dressel shared his opinions on Biles's withdrawal while talking with Craig Melvin on TODAY.

The twenty-four-year-old told Melvin that he thought "no one else's opinion matters" in regards to her situation.

"I don't know what is considered too much," he said. "Every individual is different. That's why I'm not going to speak on anyone else's behalf. That's why I'm OK with this call that Simone did. No one else's opinion matters, because they're not the one that's in her situation."

"She's literally the best ever to do it, and then everyone wants to chime in," he said, adding that critics should "just leave her alone."

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And it seems Dressel's advice to critics has resonated with a lot of people as they took to social media to agree with him.

"Exactly... it's not your journey. So, sit back and if you can't be supportive of our Olympian athletes... then," one person wrote.

"I agree. In the end, she's the one that has to deal with the consequences of her actions. Had she gone on she might be sitting in a wheelchair right now or maybe she would have done great. That is what she has to decide," said another.

"Good for you saying that Caleb! Nobody knows what's she's experiencing," wrote a third.

Dressel also opened up about the pressure he's experienced while at the Games.

"I've had a couple of breakdowns," Dressel explained. "It does pile up, but it's worth it."

Despite withdrawing from other events, Simone is due to take part in Tuesday's balance beam event.