What he has actually been mroe explicit about wanting to dismantle (and what his faction has made considerable progress dismantling in his favor already) is not as much “democratic institutions” as “the rule of law”, though his most dramatic failed attempt to dismantle that was also directed at democratic institutions (the set of schemes including the false electors gambit, attempte to get the VP to reject proper electoral votes, and instigating the mob attack on the capitol when it was clear the VP would not do so.)