The number of candidates for the U.S. Democratic presidential primaries in 2020 rose to 15 this week, with former Texas Congressman Beto O'Rourke announcing his run. Among the field of candidates are seven sitting members of Congress, six women and also five minority candidates. Other bids came from former and current mayors, an entrepreneur and a self-help author, who has been called Oprah's spiritual adviser.
Two candidates, Sen. Kirsten Gillibrand (D-NY) and Pete Buttigieg, decided to form what is called an exploratory committee ahead of a proper campaign announcement, but are almost certainly attempting a run for president. Sen. Elizabeth Warren (D-MA) has already upgraded from "exploring" to a full-flegded campaign.
The only candidate for the Republican primaries so far is the current president of the United States
, Donald Trump. He filed for a 2020 run on Jan 20, 2017, the day of his inauguration, according to documents filed with the Federal Election Commission
. A primary challenge to a sitting president is possible, but unlikely. The last time such a challenge happened was when Republican Pat Buchanan challenged sitting president George H. W. Bush in 1992. This time around, former Massachusets governor William Weld said he would challenge Trump for the Republican nomination, but hasn't filed with the FEC yet.