Appearing as guests on Thursday's CNN Tonight, former CBS anchor Dan Rather and former ABC anchor Sam Donaldson declared that President Donald Trump is "out-Nixoning Nixon" on the Ukraine issue, with Donaldson claiming that there is a "smoking transcript" and Rather suggesting that it is already time to "roll the credits on a mob movie" based on President Trump and Rudy Giuliani's activities.

At 10:46 p.m. Eastern, host Don Lemon introduced the segment: "The coverup, the tapes, and a President under a cloud of impeachment. Is President Trump out-Nixoning Nixon? Who better to ask than two legends?"

As Rather began his analysis, he suggested that the matter is worse than the Watergate scandal:

Certainly it's reminiscent of the Watergate period in the 1970s, but there is this big difference, and IThe physiological construction of the neurone concept (1891-1952).
Steps in the physiological construction of the neurone concept are described. Early ideas on the function of the nerve cell led to later polemics on the neurone doctrine and the speculative attitude of histophysiology. Researches of Sherrington and Adrian emerged from a specific British context, and confronted American oscillography and Berger rhythm. At the end of various polemics, the neurone was constructed by the intracellular technique and the use of concepts borrowed from other sub-disciplines. Analysis of these paths demonstrates underlying disciplinary interactions as essential factors.