State officials had asked the justices to step in to allow the state to use a congressional map in the midterms that was drawn by Democrats and recently approved by voters.
Federal officials say that hundreds of additional agents, officers and National Guard troops will be deployed ahead of the nation's 250th birthday celebration.
Gov. Jared Polis, a Democrat, commuted the sentence of Ms. Peters, a former county clerk serving a nine-year sentence for her role in a plot to examine voting machines after the 2020 election.
Senator Bill Cassidy, targeted by President Trump, is walking a political tightrope as he battles other Republicans for the chance to seek a third term.
Having deferred to the president for months, G.O.P. lawmakers missed crucial milestones to try to limit his war powers. That has tied their hands in seeking parameters and exit criteria.