PHOTO: Getty Images
Now playing
01:21
Trump slams Biden in morning tweet
PHOTO: CNNMoney
Now playing
06:22
How Trump's tweet sparked #WhyIDidntReport
US President Donald Trump speaks during the swearing-in ceremony for Gina Haspel as Director of the Central Intelligence Agency at CIA Headquarters in Langley, Virginia, May 21, 2018. (Photo by SAUL LOEB / AFP)        (Photo credit should read SAUL LOEB/AFP/Getty Images)
US President Donald Trump speaks during the swearing-in ceremony for Gina Haspel as Director of the Central Intelligence Agency at CIA Headquarters in Langley, Virginia, May 21, 2018. (Photo by SAUL LOEB / AFP) (Photo credit should read SAUL LOEB/AFP/Getty Images)
PHOTO: SAUL LOEB/AFP/Getty Images
Now playing
02:03
These are the highlights of Trump's Twitter habit
PHOTO: CNN
Now playing
02:03
Lawmaker: You won't win Twitter war with Trump
trump twitter demanda libertad expresion vo dusa directo usa_00010127.jpg
trump twitter demanda libertad expresion vo dusa directo usa_00010127.jpg
Now playing
02:52
Does Trump purposely include typos in tweets?
NEW YORK, NY - DECEMBER 13: (L to R) President-elect Donald Trump and Kanye West stand together in the lobby at Trump Tower, December 13, 2016 in New York City. President-elect Donald Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration.
NEW YORK, NY - DECEMBER 13: (L to R) President-elect Donald Trump and Kanye West stand together in the lobby at Trump Tower, December 13, 2016 in New York City. President-elect Donald Trump and his transition team are in the process of filling cabinet and other high level positions for the new administration.
PHOTO: Getty Images
Now playing
01:04
Yes, President Trump just retweeted Kanye West
PHOTO: photo illustration: getty images/flatiron books/allie schmitz/cnn
Now playing
01:44
Trump unloads on Twitter at Comey
Maggie Haberman 4.23
Maggie Haberman 4.23
PHOTO: CNN
Now playing
02:06
Maggie Haberman responds after Trump attack
PHOTO: Allie Schmitz/CNNMoney
Now playing
01:55
These are Trump's deleted tweets (2018)
PHOTO: Twitter / @realDonaldTrump
Now playing
01:08
Trump tweets photo from GOP leadership dinner
PHOTO: Will Mullery/CNN Politics
Now playing
03:31
What Trump's tweets taught us in 2017
PHOTO: CNN
Now playing
00:59
Stelter: Trump's tweet on CNN is crazy talk
clapper new day
clapper new day
PHOTO: CNN
Now playing
01:10
Clapper on tweets: Trump is his own worst enemy
US President Donald Trump arrives at Palm Beach International Airport in West Palm Beach, Florida, on February 16, 2018. / AFP PHOTO / JIM WATSON        (Photo credit should read JIM WATSON/AFP/Getty Images)
US President Donald Trump arrives at Palm Beach International Airport in West Palm Beach, Florida, on February 16, 2018. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
PHOTO: JIM WATSON/AFP/AFP/Getty Images
Now playing
02:18
Trump slams Oprah, calls her insecure
PHOTO: CNN
Now playing
01:58
Trump explains tweets on his mental state
WASHINGTON, DC - DECEMBER 21:  U.S. President Donald Trump tells reporters that he is leaving the White House to visit troops at Walter Reed National Military Medical Center December 21, 2017 in Washington, DC. Trump said he was visiting the injured military service members to wish them a merry Christmas.  (Photo by Chip Somodevilla/Getty Images)
WASHINGTON, DC - DECEMBER 21: U.S. President Donald Trump tells reporters that he is leaving the White House to visit troops at Walter Reed National Military Medical Center December 21, 2017 in Washington, DC. Trump said he was visiting the injured military service members to wish them a merry Christmas. (Photo by Chip Somodevilla/Getty Images)
PHOTO: Chip Somodevilla/Getty Images North America/Getty Images
Now playing
02:08
Trump: I'm a very stable genius
(CNN) —  

President Donald Trump is striking back at former Vice President Joe Biden, a potential 2020 election rival, for suggesting he would “beat the hell out of” Trump if they were in high school.

“Crazy Joe Biden is trying to act like a tough guy. Actually, he is weak, both mentally and physically, and yet he threatens me, for the second time, with physical assault,” Trump tweeted Thursday morning.

“He doesn’t know me, but he would go down fast and hard, crying all the way. Don’t threaten people Joe!” Trump warned.

Biden suggested Tuesday that he would “beat the hell out of” Trump if they were in high school over Trump’s lewd comments about women that he made in an “Access Hollywood” video that surfaced in 2016.

“They asked me would I like to debate this gentleman, and I said no. I said, ‘If we were in high school, I’d take him behind the gym and beat the hell out of him,” Biden said in a speech at the University of Miami.

Biden had made similar comments about Trump during the 2016 election when he was campaigning for Hillary Clinton.

Trump and Biden could potentially face off in the 2020 presidential election as Biden has left the door open to a possible run. A CNN poll conducted by SSRS in January found Biden leading Trump by a wide 57% to 40% split.