President Joe Biden opted out of a dinner with his NATO counterparts in Vilnius, Lithuania, with United States officials citing his busy schedule abroad.

"Biden is not attending tonight’s dinner with NATO leaders," a U.S. official told reporters Tuesday. The official said the president has "four full days of official business and is preparing for a big speech tomorrow, in addition to another day at the summit."

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The dinner was never part of Biden's itinerary, with plans for Secretary of State Antony Blinken to represent the president at the event instead.

At 80, Biden's schedule attracts attention.

"In private, some officials acknowledge that they make what they consider reasonable accommodations not to physically tax an aging president," the New York Times reported last month. "His staff schedules most of his public appearances between noon and 4 p.m. and leaves him alone on weekends as much as possible."

Biden spent the day participating in NATO ceremonial activities and the heads of state and government meeting, as well as bilateral sit-downs with Presidents Gitanas Nauseda of Lithuania and Recep Tayyip Erdogan of Turkey.

On Wednesday, he has more NATO meetings, including one of the NATO-Ukraine Council, and is expected to deliver remarks before flying to Helsinki, Finland for the U.S.-Nordic Leaders Summit and its sideline engagements.

Biden's meeting with Erdogan came one day after the Turkish president announced his support for Sweden becoming a NATO member following a year of opposition to the move.

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"Now you are getting prepared for the forthcoming elections," Erdogan told Biden. "And with the forthcoming elections, I would like to take this opportunity to also wish you the best of luck."

"We look forward to meeting with you the next five years," Biden replied.