Background: Patrick Joseph Buchanan (; born November 2, 1938) is an American paleoconservative political commentator, author, syndicated columnist, politician, and broadcaster. 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. He sought the Republican presidential nomination in 1992 and 1996. He ran on the Reform Party ticket in the 2000 presidential election.
Context: Buchanan wrote that it was impossible for 850,000 Jews to be killed by diesel exhaust fed into the gas chamber at Treblinka in a column for the New York Post in 1990. Buchanan once argued Treblinka "was not a death camp but a transit camp used as a 'pass-through point' for prisoners". In fact, some 900,000 Jews had died at Treblinka. When George Will challenged him about it on TV, Buchanan did not reply. In 1991 William F. Buckley, Jr. wrote a 40,000-word National Review article discussing anti-Semitism among conservative commentators focused largely on Buchanan; the article and many responses to it were collected in the book In Search of Anti-Semitism (1992). He concluded: "I find it impossible to defend Pat Buchanan against the charge that what he did and said during the period under examination amounted to anti-Semitism."  The Anti-Defamation League has called Buchanan an "unrepentant bigot" who "repeatedly demonizes Jews and minorities and openly affiliates with white supremacists." "There's no doubt," said Pulitzer Prize-winning columnist Charles Krauthammer, "he makes subliminal appeals to prejudice." Buchanan denies that he is antisemitic, and a number of his journalistic colleagues, including Murray Rothbard, Justin Raimondo, Jack Germond, Al Hunt and Mark Shields, have defended him against the charge. As a member of the Reagan White House, he is accused of having suppressed the Reagan Justice Department's investigation into Nazi scientists brought to America by the OSS's Operation Paperclip. In the context of the Gulf War, on September 15, 1990, Buchanan appeared on The McLaughlin Group and said that "there are only two groups that are beating the drums for war in the Middle East - the Israeli defense ministry and its 'amen corner' in the United States." He also said: "The Israelis want this war desperately because they want the United States to destroy the Iraqi war machine. They want us to finish them off. They don't care about our relations with the Arab world." Furthermore, on The McLaughlin Group Buchanan has also made such comments as "'Capitol Hill is Israeli occupied territory' and 'If you want to know ethnicity and power in the United States Senate, 13 members of the Senate are Jewish folks who are from 2 percent of the population. That is where real power is at...'"  Buchanan supported President Reagan's plan to visit a German military cemetery at Bitburg in 1985, where among buried Wehrmacht soldiers were the graves of 48 Waffen SS members. At the insistence of German Chancellor Helmut Kohl and over the vocal objections of Jewish groups, the trip went through.  In an interview, author Elie Wiesel described attending a White House meeting of Jewish leaders about the trip: "The only one really defending the trip was Pat Buchanan, saying, 'We cannot give the perception of the President being subjected to Jewish pressure.'"  Buchanan accused Wiesel of fabricating the story in an ABC interview in 1992: "I didn't say it and Elie Wiesel wasn't even in the meeting [...] That meeting was held three weeks before the Bitburg summit was held. If I had said that, it would have been out of there within hours and on the news".
Question: Did he often deny the holocaust happened?

Answer: