In the context of the events surrounding January 6, Trump's patently false claims(which he knows are false) of widespread election fraud, his encouragement of his supporters to "fight like hell" to overturn the election results, and his refusal to promptly condemn the violence at the Capitol is crystal clear evidence of giving "aid or comfort" to those engaging in insurrection.
This alone meets the standard of the language in the 14th amendment and should preclude him from ever holding office again.
“A man who has nothing which he is willing to fight for... is a miserable creature who has no chance of being free.”
— John Stuart Mill----On Liberty
— John Stuart Mill----On Liberty