Trump dropped the bombshell via a pre-recorded statement made in the White House and sent out on Twitter.
The visit followed the hospital's mask protocols for public speakers, based on the District of Columbia health guidance.
Obama's claim comes amid reports that outgoing President Donald Trump's son, Donald Trump Jr., is preparing for a political career.
According to Melania's statement, it is meant to be used solely by first families for "leisure time."
Trump has barely left the White House since Biden was projected winner of the election on November 7, though he has made a number of trips to his nearby golf course.
The staff at Mar-a-Lago in Florida have been making preparations for the arrival of the Trump family.
Twitter users expressed surprise after discovering that the two used to be a couple two decades ago.
Melania stood apart from Donald Trump during the entire ceremony, but at the same time flouted social distancing rules.
Jenna Bush recently said she and her sister Barbara "loved" passing the first-daughter torch to Malia and Sasha Obama 12 years ago.
Under former US president Barack Obama, Ron Klain coordinated the White House response to the Ebola crisis in 2014.
Ivana Trump noted that before returning to his normal life, Donald will have to go and declare that he lost.
Donald Trump had previously hit out at his former aide on Twitter calling her a "dog" with "zero credibility."
The US president-elect Joe Biden's Irish cousins recently gathered under a pop art-style mural of him to celebrate his victory.
On Monday, a group of leading scientists and experts will be named as transition advisers to help convert the Biden-Harris plan into reality from January 20.
An insurmountable lead in Pennsylvania took Biden, 77, over the top in the state-by-state count that decides the presidency.
US president Donald Trump offered little indication on Friday that he was prepared to concede defeat.
The "Gucci Gang" rapper, Lil Pump was seen posing with full-grown tigers and tiger cubs, a chimpanzee, and an elephant.
Several media outlets took Donald Trump off-air mid-speech due to his remarks questioning the integrity of the election process.
The American rapper Kanye West couldn't even reach 0.5% of the vote in the 12 states where he was present on the ballots.
However, Denise Bidot has left people confused with her reactions to the split rumours.
Meanwhile, Rihanna completely transformed her Instagram page to demand: "count every vote we'll wait."
Melania Trump who is campaigning for Donald Trump's re-election to the White House, spoke to media outside the polling booth.