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Meta !Sober//iZs joined in and replied with this 6 years ago, 3 hours later, 3 hours after the original post[^][v]#1,078,341
How many presidents have even said anything at all on national TV?
Harry Truman would appear to be the first, in 1947*. Starting with Truman that makes 13 national TV presidents. So 32/45 (71%) presidents have never been on national TV at all during their presidencies.
So the actual question you are asking is: Who is the only president --in US history-- who stated on national TV that he wanted to talk away gins and worry about due process later?
Since the majority of presidents were not only out of office but dead by the time broadcast television was a thing, it's not really fair to include all the presidents in US history in the question because they never had a chance to say anything on national TV.
beckyderp !3NeoVaGFAg joined in and replied with this 6 years ago, 5 minutes later, 3 hours after the original post[^][v]#1,078,345
Meta !Sober//iZs replied with this 6 years ago, 17 minutes later, 4 hours after the original post[^][v]#1,078,352
@previous (beckyderp !3NeoVaGFAg)
Even then, how many people even had TVs in 1947??? ?
This Brittanica article says fewer than 2% of American households had a television in 1948. Even Truman's first televised speech would not have been seen by ~98% of Americans though it could, in theory, have been seen by them if they owned a television so I would say Truman in 1947 is really the first national TV president.