Which of the  high-profile candidates vied for the Reform Party presidential primaries, 2000 was a senior advisor to U.S. Presidents Richard Nixon? 
Reform Party presidential primaries, 2000:  Several high-profile candidates vied for the nomination, including Donald Trump, Pat Buchanan, and physicist John Hagelin. Pat Buchanan:  Buchanan was a senior advisor to U.S. Presidents Richard Nixon, Gerald Ford and Ronald Reagan, and was an original host on CNN's "Crossfire".
Pat Buchanan