Donald John Trump Jr. is an American businessman and former reality TV personality. He is the eldest child of the 45th President of the United States, Donald Trump, and his first wife, Ivana. wikipedia.org
Definition #2 for "donald trump jr"
Donald Trump Jr. is the oldest son of President Donald Trump. He works as a trustee and executive director of a trust controlling The Trump Organization while his father serves his presidency. He has been a prominent figure in the Russiagate scandal, particularly when it was revealed he met with Russian agents to receive damaging information on Hillary Clinton in the 2016 United States Presidential Election.