A growing group of Senate Republicans and centrist Democrats is working on legislation to overhaul the Electoral Count Act, the 19th-century law that former President Donald J. Trump sought to exploit to overturn the 2020 presidential election. That effort is expanding to include other measures aimed at preventing interference in election administration, such as barring the removal of nonpartisan election officials without cause and creating federal penalties for the harassment or intimidation of election officials…

A separate group — including two Democratic senators, Richard J. Durbin of Illinois and Amy Klobuchar of Minnesota, and Senator Angus King, a left-of-center independent from Maine — is looking at changing how Congress formalizes the election results to head off another attempt like the one Mr. Trump made to have allies on Capitol Hill try to toss out state electoral votes.

But most Democrats are reluctant even to discuss the matter until after the far more comprehensive voting rights bill they call the Freedom to Vote Act is put to rest next week, a near certainty after Ms. Sinema and Mr. Manchin said this week that they would not vote to change Senate rules on the filibuster to enable their party to push it through unilaterally.