President Trump handing the powers of the presidency to Vice President Pence is "not something that's on the table at this point," White House national security adviser Robert O'Brien told CBS' "Face the Nation" on Sunday.

Driving the news: The president "feels very well" and will remain at Walter Reed hospital, where he has been since Friday, for "at least another period of time," O'Brien said.

  • This comes after White House Chief of Staff Mark Meadows told Fox News on Saturday night: "[H]e's made unbelievable improvements from yesterday morning, when I know a number of us, the doctor and I, were very concerned. ... He had a fever and a blood oxygen level that dropped rapidly."

O'Brien acknowledged the possibility of Trump's condition deteriorating "just like it could happen to anybody, but we're prepared."

  • "We have a great vice president. We have a government that is steady."
  • "The government's doing well, the president's doing well, and I'm not going to address hypotheticals, but we have plans for everything."

How it works: Under the 25th Amendment, the vice president has authority to step in if the president gives written notice to congressional leadership that he is unable to discharge the power and duties of his office.

  • President Reagan briefly handed his duties to Vice President George H.W. Bush when he went under anesthesia for a precancerous colon procedure. President Bush transferred his authorities to Vice President Cheney in 2002 and 2007, both during colonoscopies.
  • "If both the president and vice president are very sick but functioning, they can delegate decisions to subordinates," Jonathan Turley, a professor of law at George Washington University, told Axios' Hans Nichols early Friday.
  • "Actual succession under the 25th Amendment only kicks in with an effective vacancy due to death or complete incapacity," Turley said.

Go deeper: A look at the presidential chain of command

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Pence to continue traveling despite aides testing positive for COVID-19

Marc Short with Pence in March. Photo: Drew Angerer/Getty Images

Marc Short, Vice President Mike Pence’s chief of staff, tested positive for the coronavirus Saturday and is quarantining, according to a White House statement.

Why it matters: Short is Pence's closest aide, and was one of the most powerful forces on the White House coronavirus task force. Pence and second lady Karen Pence tested negative for the virus on Sunday morning, according to the vice president's office.

Updated 2 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Aïda Amer/Axios

  1. Politics: Pence chief of staff Marc Short tests positive for coronavirus — COVID-19 looms over White House Halloween celebrations.
  2. Health: Fauci says maybe we should mandate masks if people don't wear them — America was sick well before it ever got COVID-19U.S. reports over 80,000 new cases for 2nd straight day
  3. World: Polish President Andrzej Duda tests positive for COVID-19.
Oct 24, 2020 - World

Poland's president tests positive for coronavirus

Duda. Photo: Sergii Kharchenko/NurPhoto via Getty Images

Polish President Andrzej Duda has tested positive for the coronavirus, a spokesperson announced on Saturday.

The big picture: Duda is reportedly feeling well and in isolation. His positive test comes amid a massive uptick in COVID-19 throughout the country and elsewhere across Europe.

  • Poland had previously warded off the virus with relative success, but is now facing a massive influx of cases that threatens to overwhelm its medical system.
  • The nation on Saturday tracked "13,628 new cases and 179 new deaths — a record number of deaths in one day since the start of pandemic," AP reports.