A New York Times columnist has called for embattled Harvard University president Claudine Gay’s ouster amid accusations of plagiarism, writing that the situation has reached “a tipping point.” John McWhorter, a linguist professor at Columbia University, wrote an opinion piece for the New York Times on Thursday in which he said Gay should resign if the Ivy League school declines to dismiss her from her post. Gay allegedly quoted or paraphrased authors more than 40 times without proper attribution in her academic works — which breaks the school’s strict rules on plagiarism. “Harvard has a clear policy on plagiarism that...