Critics have long complained that President Joe Biden lacks the mental and physical stamina necessary to serve as president.

Those complaints grew louder this weekend after staff all but rushed the president off stage following a press conference on Sunday.

President ends briefing by telling reporters that he is "going to bed"

According to Fox News, the incident occurred during the president's trip to Vietnam following the G20 summit in New Delhi, India.

The network noted that Biden took a total of five questions from reporters before telling them that he was "going to bed."

Sleepy Joe! | Biden tells Vietnam press conference 'I'm going to bed!' 👾 pic.twitter.com/EpCwn8YEpF

— Dumb Globe (@DumbGlobe) September 11, 2023

That remark came after he was asked a question about his recent G20 summit meeting with Chinese Premier Li Qiang.

Biden insists meeting with Chinese premier "wasn't confrontational at all"

"What did you talk about with Mr. Li? You said you spoke with the number two from China in India today," the reporter asked.

Breaking 快讯：拜登总统刚才证实，他在G20峰会上与 #习近平 二把手 #李强 交谈，谈到维持稳定，确保南方世界能够获得所需等，而且两人交流时并无冲突。President Biden @potus just confirmed that he spoke to China’s Premier Li Qiang at G20 Summit and it wasn’t confrontational. pic.twitter.com/oP4xmz1GWR

— 黄耀毅 (@VOAYYH) September 10, 2023

"Yeah, we talked…we talked about…we talked about it at the conference. Overall, we talked about stability," Biden said in response.

"We talked about making sure that the Third World, the Third World….the Southern Hemisphere had access to change. It had access," the president said before stressing that the conversation "wasn't confrontational at all."

Biden derides climate change skeptics as "dog-faced pony soldiers"

Earlier, the president lashed out at those who express skepticism regarding climate change, deriding them as "a lot of lying, dog-faced pony soldiers." He then added, "All of a sudden, they’re all realizing it’s a problem. And there’s nothing like seeing the light."

Joe Biden: “The Indian looks at John Wayne and points to the Union soldier and says, 'He's a lying, dog-faced pony soldier!' Well, there's a lot of lying, dog-faced pony soldiers out there about global warming!" pic.twitter.com/a0GP22rIJl

— Catch Up (@CatchUpFeed) September 10, 2023

Fox News noted that a White House official defended Biden's performance at the press conference, saying, "The President substantively answered questions from 7 reporters."

"This is a distraction, and it would do your readers a good service to dive into his answers on China, relations with Indo-Pacific countries, human rights and climate change instead," the official added.