"Reuters could not find any evidence of these remarks being made on Jan. 21, 2021 in any media reports, nor on the White House website (here) , which archives statements, releases, speeches and remarks made by Harris and the Biden administration."
https://www.reuters.com/article/uk-factcheck-vp-quote-military/fact-check-kamala-harris-did-not-say-military-would-be-used-against-trump-supporters-idUSKBN2A81XM
Stay in the shallow end, (i.e. TWITTER).