Things did not go particularly well for President Joe Biden on Thursday of last week, when he not only took a very public tumble on stage at the Air Force Academy, but he also smacked his head on the door of Marine One upon his return to D.C., as Fox News reports.

Not surprisingly, the incidents have once again sparked questions about the 80-year-old president's health and his ability to serve another four years in the Oval Office should he win reelection in 2024.

Difficult day

Biden's troubles on Thursday began when, after participating in commencement proceedings at the Air Force Academy in Colorado, he tripped and went careening to the stage floor in front of shocked onlookers, as The Hill noted.

The president was swiftly helped to his feet by members of his Secret Service detail, and he could then be seen pointing to some sort of obstacle that was apparently in his path – later said to have been a sandbag.

White House communications director Ben LaBolt soon tweeted words of reassurance to the country, saying of the president, “He's fine” and offering the sandbag explanation.

As the New York Post noted, however, the on-stage mishap in Colorado was not the last accident to befall Biden that day.

Knock to the noggin

According to a press pool report from Biden's return to Washington in the early evening, the president “bumped his head on the doorframe” of Marine One as he headed back to the official residence.

Though Biden did not appear to sustain serious harm in the incident, he was seen rubbing his head as he traversed the lawn.

The commander in chief also attempted to joke about the day's calamities, telling reporters of his on-stage tumble, “I got sandbagged,” as the Associated Press explained.

Biden then engaged in a sort of jogging motion as he headed toward the White House, perhaps endeavoring to highlight a degree of physical vigor his critics have argued he lacks.

Concerns continue to mount

Even though Biden is no stranger to the occasional slip and fall, the fact that he had two incidents of physical difficulty in one day prompted a strong reaction from critics, many of whom suggested that he is simply too old to run for a second term – or perhaps even to complete the current one.

Judicial Watch president Tom Fitton weighed in on the matter, according to the Post, saying that the situation “dramatically and further illustrates [Biden's] age-related cognitive and physical challenges.”

Republican presidential primary candidate Nikki Haley pointed to the concerns many Americans share with regard to another Biden term, saying, according to Fox News, “No one should feel good about watching the president fall. While this is hard to see, we have to be honest with the American people. Our enemies see the same TV clips and wonder who is in charge,” adding, “Joe Biden is the oldest president in history, and if he's reelected, we could end up with a President [Kamala] Harris.”

Frequent Biden health skeptic, former White House physician and current Congressman Ronny Jackson (R-TX) responded to Thursday's events in even starker terms by saying, “This man's not fit mentally or physically to be our president, and it's a bad situation for us” and adding his belief that it is “malpractice” for those around the president to allow him to seek another term.