President Trump at Walter Reed Medical National Military Medical Center for coronavirus treatment

Trump is facing the most serious known health condition of a sitting president in history.

President Trump arrived at Walter Reed Medical Center on Friday evening where he will be monitored following his positive COVID-19 test on Thursday night, according to a White House report. First Lady Melania Trump was not seen joining him on Marines One.

This follows a prior announcement of the couple’s preemptive self-quarantine due to a positive test result from White House adviser Hope Hicks on Oct. 1.

According to White House Chief of Staff Mark Meadows, President Trump is exhibiting only “mild symptoms,” limited to a fever, nasal congestion and a cough.

However, Trump’s old age and the potential underlying health conditions caused by his obesity place him at a higher risk of severe illness from the virus. According to his last physical, made public in June, Trump is overweight for his height, weighing 244 pounds and standing at 6 feet, 3 inches tall.

His contraction of the virus, which has killed over 200,000 people in the U.S., is the most serious known health condition to affect a sitting president in history.

Robert Shrum, director of the USC Dornsife Center for the Political Future says that Trump’s location change to the center doesn’t necessarily connote a potential transfer of power.

“We’ve never had a formal transfer of power while the President was sick,” Shrum said. “Not even when Ronald Reagan was in the hospital.”

According to his spokesperson, Vice President Mike Pence and Second Lady Karen Pence have tested negative for the virus.

Democratic presidential nominee Joe Biden and his wife Jill Biden, along with his running mate Kamala Harris, have also tested negative.

Biden extended sympathy to his opponent in a Tweet this morning, stating that he and his wife send their thoughts to the First couple and “will continue to pray for the health and safety of the president and his family.”

At Tuesday’s presidential debate, Trump made fun of Biden for wearing a mask.

Masks have been visible throughout Biden’s campaign. He and Harris have been pictured sporting masks in campaign ads and rallies.

The Trumps are speculated to have contracted COVID-19 at Amy Coney Barrett’s nomination last Friday. Senator Mike Lee of Utah and the University of Notre Dame’s president Father John Jenkins who attended the event have also tested positive for the virus.

Prospective Trump campaign and First Family events have been postponed or moved to an online setting.