Donald Trump is a member of the Republican Party. This information is directly stated in various news articles, including the one provided. The evidence does not provide specific details about Trump’s early life or career before his entry into politics. However, it does confirm his affiliation with the Republican Party during his presidential campaigns. The evidence does not contain information about Trump’s current party affiliation or any changes in his party membership. The article from ABC News focuses on key takeaways from Trump’s election speeches, which primarily discuss his campaign promises and policies. The evidence does not provide information about Trump’s personal life, family, or business background.