Ron Paul did not run for President in 2016.
During the Republican primaries, Ron Paul endorsed his son Rand Paul. After dropping out of the race, Rand Paul endorsed Donald Trump, but Ron Paul did not endorsed any of the remaining candidates – Donald Trump, Hillary Clinton, Gary Johnson or Jill Stein.
Ron Paul did praise Jill Stein on foreign policy but emphasized that he is not endorsing her. He made fun of Gary Johnson’s “Aleppo” moment, exposed Hillary Clinton’s corrupt activities and criticized Donald Trump for his opposition to free trade and small government. But Ron Paul also stated that the supposed differences between these candidates are mostly an invention by the media.