US President Donald Trump said his COVID-19 experience has taught him a lot and that he now "gets it".

Trump on Sunday, October 4, made a brief drive outside the Walter Reed National Military Medical Center, where he is being treated for COVID-19.

Shortly before he left the hospital, Trump posted a video on Twitter, saying "I also think we will pay a little surprise to the patriots that are waiting outside in the streets."

In the video, Trump said that he had "a very interesting journey" where he learned a lot about COVID-19 by going to the "real school" and not the "read the book school".

"It has been a very interesting journey. I learned a lot about COVID-19. I learned by really going to the school and this is the real school and this isn't the read the book school. And I get it and I understand it," he said.

On Thursday, October 1, President Donald Trump and First Lady Melania Trump tested positive for coronavirus. 

Watch Trump speak from the hospital where he's isolated in the video below.