Considering the news that a coronavirus-positive President Trump is being moved to Walter Reed military hospital, Vice President Mike Pence’s movements over the next few days will offer the best guide as to Trump’s health status.

The White House says that the president will be at Walter Reed for the next few days. Moving to the hospital is the right decision, ensuring the commander in chief has the best possible guardianship against unexpected decline. But over the next few days, the key metric for how Trump is doing health-wise will be the movements of the vice president.