Candidate No. 16 entered the race on Tuesday and he might be the most unconventional one yet — billionaire entrepreneur Donald Trump.
After waving to the crowd from up high in the Trump Tower in New York City, Trump descended to the stage via escalator and made a lengthy, passionate, stream-of-consciousness speech.
Announcing his candidacy for president, Trump promised: "We are going to make our country great again."
"Our country is in serious trouble," he said. "We don't have victories anymore."