There is a federal statute that is applicable which will be used by the Democratic national and state parties.
18 U.S. Code § 592:
Whoever, being an officer of the Army or Navy, OR OTHER PERSON IN THE CIVIL, military, or naval service of the United States, orders, brings, keeps, or has under his authority or control any troops or armed men at any place where a general or special election is held, unless such force be necessary to repel armed enemies of the United States, SHALL BE FINED UNDER THIS TITLE OR IMPRISONED NOT MORE THAN FIVE YEARS, OR BOTH; and be disqualified from holding any office of honor, profit, or trust under the United States.
This federal statute has been interpreted by legal analyst as including federal civil servants and armed federal law enforcement agents, such as those from @ICEgov or @DHSgov

18 U.S. Code § 592 makes it a crime punishable by 5 years in prison to deploy federal troops to polling places...
— (@rlyon.bsky.social) 2026-02-06T12:03:14.782Z
This law would apply to ICE and DHS officers if they tried to block access to polling places. This law was discussed on MS NOW a couple of times. Basically one could seek an injunction to block the military, ICE or DHS from interfering with polling places