Whoever wins in November is likely to have several vacancies to fill on a court where the average age is over 65.
Ruth Bader-Ginsburg, the court's oldest justice, has had a series of health scares in recent years.
Her diagnosis was confirmed on Monday following oral arguments, also held by teleconference due to the coronavirus crisis.
She was hospitalized last November for two nights suffering from a fever and chills but returned to work at the court the day after being released.
The court's oldest justice has had a host of health issues in recent years.
Johnson said he takes precautions, including wiping down the equipment before the 87-year-old Ginsburg works out and social distancing.
“I’m cancer free. That’s good,” she said in the interview in her chambers.
The 86-year-old justice has become an icon often referred to by her fans as "RBG."
As much damage as Trump is doing to the nation today, his most lasting harm will be the generation of judges who will still have their jobs long after we’ve tried to forget him.
The Dwight D. Opperman Foundation announced the new Justice Ruth Bader Ginsburg Woman of Leadership Award on Tuesday in honor of Ginsburg’s “exemplary career and life.”