Leaders from the 31-member North Atlantic Treaty Organization (NATO) traveled for a summit in Lithuania's capital city of Vilnius this week.

Yet while the gathering was focused on standing up to Russia's Vladimir Putin, President Joe Biden is said to have surrendered to fatigue. 

Biden skipped opening dinner

According to the New York Post, the president "raised eyebrows on Tuesday" by choosing not to join other heads of state at an opening dinner.

An unnamed official was quoted as saying that the 80-year-old had to rest up as he had "four full days of official business" and needed to prepare "for a big speech" on Wednesday.

NEW: President Biden is not attending tonight’s dinner with NATO leaders. Asked why he is skipping it, a US official said the president has had four full days of official business and is preparing for a big speech tomorrow in addition to another day at the summit.

— Beth Rigby (@BethRigby) July 11, 2023

That led some observers to point out how the commander in chief just spent last weekend on the beach in his home state of Delaware. The critics included Abigail Marone, who serves as communications director for Missouri Republican Sen. Josh Hawley.

"He almost worked a whole standard work week."

She tweeted out an image of Biden sprawled out on a beach chair that was captioned with the words, "Biden, literally *3* days ago."

Biden, literally *3* days ago: https://t.co/NqfcR6TCVm pic.twitter.com/bCYGPjPRxE

— Abigail Marone 🇺🇸 (@abigailmarone) July 11, 2023

Conservative commentator Shashank Tripathi spoke up as well, joking, "He almost worked a whole standard work week. He needs a break!"

He almost worked a whole standard work week. He needs a break! https://t.co/KokNt1SYGH

— Comfortably Smug (@ComfortablySmug) July 11, 2023

Report: Biden frequently lashes out at staff

The story comes in the wake of a report from Axios that Biden frequently becomes frustrated and harangues staff with profanity laced rants.

"Behind closed doors, Biden has such a quick-trigger temper that some aides try to avoid meeting alone with him. Some take a colleague, almost as a shield against a solo blast," contributor Alex Thompson wrote.

The National Institute on Aging notes how those suffering from dementia "may become agitated or aggressive" and can be a sign "that a person is restless or worried."

Meanwhile, MSNBC host Mika Brzezinski recently complained that White House staff aren't doing enough to hide the president's infirmities, saying, "It makes me mad."

MSNBC’s ⁦@morningmika to Biden’s staff: “Do a better job b/c you can’t have these video images of the president tripping or the president like going to wrong way … b/c his age is going to be factor … It makes me mad.” pic.twitter.com/DDsLitF8vA

— Tom Elliott (@tomselliott) July 12, 2023