Concerns about US President Biden's age have been brought back into the spotlight after a report by US Special Counsel Robert Hur described him as a "sympathetic, well-meaning, elderly man with a poor memory."

USSC CEO Dr Michael Green tells SBS News that here has been "no indication" from those he knows in the Biden administration that the president's decision-making or mental capacities were "diminished".

"He comes to the job with an enormous amount of experience," Dr Green says. "You may not always agree with him, but on something like Gaza, he knew exactly what he believed in. He'd been working on the issue for decades."