Fox News has reported that King Charles and Queen Consort Camilla are scheduled to have their official coronation at Westminster Abbey on May 6.

While the event will be attended by many heads of state, President Joe Biden may not be among them, with the New York Post stating that First Lady Jill Biden could go in his place.

White House reportedly worried that trip would leave Biden too tired

The paper pointed to a March Time magazine article which cited an anonymous White House source as saying that Biden is planning to avoid next month's coronation ceremony.

That claim was echoed in a piece published by The Daily Telegraph this past weekend. It pointed to an unnamed White House source as saying, "The guy is 80. They space out his big bursts of activity quite considerably."

The Telegraph stressed that Biden already has two major overseas trips coming up. The president is planning to visit Northern Ireland next month as well as attend the G7 summit in Japan next month.

According to the Telegraph, the president's schedule has led to concerns that he might be left "too tired to perform his domestic duties."

Poll shows most Americans believe Biden is too old to run for a second term

Such concerns come as a growing number of Americans are questioning Biden's fitness to function as commander in chief.

A survey released last month by Yahoo News and YouGov found that some 68% of respondents believe the president is too old to run for a second term.

Former White House physician Ronny Jackson agrees with that assessment, something he made clear during an interview with Fox News in February.

"The majority of Americans can see that Biden's mental health is in total decline, yet there is no transparency from the White House on what’s going on, if anything, to address this issue and his inability to do his job," Jackson the network.

British politicians divided on Biden's absence

Meanwhile, the prospect of America's president not showing up for King Charles' coronation has drawn a mixed response from British politicians.

Conservative Member of Parliament Bob Seely serves on the House of Commons' Foreign Affairs Select Committee, and he told the Telegraph that Biden's absence would be "foolish."

"It seems pretty remiss, and I’m tempted to say more fool him for not coming. This is a once-in-a-lifetime event, and you would have thought he should come because he’s a head of state," Seely was quoted as saying.

However, Conservative Member of Parliament Tobias Ellwood took a different position, declaring, "Whilst we’d hope Joe Biden would be invited, there is no historical protocol for a US president to attend royal coronations, so we should not read too much into any absence."