I ran cross the video June 2016 Firing Line Compilation for Hoover's Summer Series and starting at
02:42 there is an exchange between the host William F. Buckley Jr. and the guest Barry Goldwater in 1966, just after serving two terms as Senator from Arizona.
Here's my transcription of the exchange:
BUCKLEY: Senator Goldwater is both a Republican and a conservative, terms which he has not found or at least not yet found to be mutually exclusive.
GOLDWATER: And I might say Bill this is my chief worry as a conservative, that we have put so much power in the office of the presidency that some day, the wrong man could come along, and I wouldn’t be so concerned about whether he could use these powers to perpetuate himself in office, but how he would use these powers to destroy people that disagreed with him, to pile up voters where voters don’ usually pile up.
I think Johnson is fully aware of the powers that he has, and he certainly has used them and will use them.
I've found the full interview here.
Considering the activities of president Nixon ten years later and some more recent events, this concern is remarkably prescient.
Question: Goldwater says "this is my chief worry as a conservative". Did he expand on this elsewhere? Did this concern about a president's "use (of) these powers to destroy people that disagreed with him" have substantial context or did it arise only at the time, possibly in relation to then president Lyndon B. Johnson?