We might as well take a quick look at the grammar of the amendment and of Trump's statement while we're at it.
As you know, the "Second Amendment people" are ardent supporters of the right of the people to bear arms, as set forth here:
A well regulated militia, being necessary to the security of a free
state, the right of the people to keep and bear arms, shall not be
Note the absolute clause there: "A well-regulated militia being necessary to the security of a free state". [Modernized punctuation; the comma after "militia" in the original does not change the meaning, and today we would hyphenate well-regulated.] The absolute clause establishes the rationale or basis for the right: to protect its security a free state requires a well-regulated militia. This need is "a given".
By the way, colonial militias maintained detailed lists of their members and of the weapons each man possessed.
When Trump says "Although the Second Amendment people—maybe there is" [sic], he is dropping the word "with", offering us his own absolute construction, presenting us with another "given": "Although, with the Second Amendment people..." which would mean "Although, given how the Second Amendment people are wont to act...".
As Trump might say, he was "just tossing the idea out there".