According to the New York City Board of Elections, Donald Trump registered in 1992 as a Republican. He remained a Republican until 1999, when he registered into the Independence Party. At the time, the Independence Party was the New York state affiliate of the Reform Party, and Trump briefly considered seeking the Reform Party’s nomination for president in 2000.
In 2001 he registered into the Democratic Party. In 2009 he registered back into the Republican Party. In 2011 he became an independent, but in 2012 he rejoined the Republican Party.