WASHINGTON — A bipartisan group of senators, including Alaska Sen. Lisa Murkowski, agreed Wednesday on proposed changes to the Electoral Count Act, the post-Civil War-era law for certifying presidential elections that came under intense scrutiny after the Jan. 6 attack on the Capitol and Donald Trump’s effort to overturn the 2020 election.

Long in the making, the package introduced by the group led by Sens. Susan Collins of Maine and Joe Manchin of West Virginia is made up of two separate proposals. One would clarify the way states submit electors and the vice president tallies the votes in Congress. The other would bolster security for state and local election officials who have faced violence and harassment.

“From the beginning, our bipartisan group has shared a vision of drafting legislation to fix the flaws of the archaic and ambiguous Electoral Count Act of 1887,” Collins, Manchin and the other 14 senators said in a joint statement.

“We have developed legislation that establishes clear guidelines for our system of certifying and counting electoral votes,” the group wrote. “We urge our colleagues in both parties to support these simple, commonsense reforms.”

Both Senate Majority Leader Chuck Schumer and Senate Republican leader Mitch McConnell have signaled support for the bipartisan group, but the final legislative package will undergo careful scrutiny.

“Election security and integrity are issues that we can all get behind,” Murkowski, a Republican running for reelection, said in a statement. “The events that occurred on January 6, 2021 must never happen again. I’m proud to join a bipartisan group of my colleagues on reforms to enhance election security and integrity, in order to ensure our elections are fair and safe,” said Senator Murkowski. “Our legislation gives more clarity to states and Congress on the electoral count process; clarifies that when the successful candidate for President and Vice President is not clear, that all candidates have equal access to information important to an orderly transition of power; provides improvements to cybersecurity testing for voting systems; and enhances penalties for individuals who threaten election workers—just to name a few. There is nothing more fundamental than the right to vote, so we are taking necessary steps to bolster the public’s trust in our elections.”

Votes are not likely before fall. But with broad support from the group of 16 senators, seven Democrats and nine Republicans, who have worked behind closed doors for months with the help of outside experts, serious consideration is assured.

In a statement, Matthew Weil, executive director of the Democracy Program at the Bipartisan Policy Center, called the framework a “critical step” in shoring up ambiguities in the Electoral Count Act.

After Trump lost the 2020 election, the defeated president orchestrated an unprecedented attempt to challenge the electors sent from battleground states to the joint session of Congress on Jan. 6, when the vice president presides over certification.

Under the proposed changes, the law would be updated to ensure the governor from each state is initially responsible for submitting electors, as a way to safeguard against states sending alternative or fake elector slates.

Additionally, the law would spell out that the vice president presides over the joint session in a “solely ministerial” capacity, according to a summary page. It says the vice president “does not have any power to solely determine, accept, reject, or otherwise adjudicate disputes over electors.”

That provision is a direct reaction to Trump’s relentless efforts to pressure then Vice President Mike Pence to reject the electors being sent from certain battleground states as a way to halt the certification or tip it away from Joe Biden’s victory.

The bill also specifies the procedures around presidential transitions, including when the election outcome is disputed, to ensure the peaceful transfer of power from one administration to the next.

That’s another pushback to the way Trump blocked Biden’s team from accessing some information for his transition to the White House.

The second proposal, revolving around election security, would double the federal penalties to up to two years in prison for individuals who “threaten or intimidate election officials, poll watchers, voters or candidates,” according to the summary.

It also would seek to improve the way the U.S. Postal Service handles election mail and “provide guidance to states to improve their mail-in ballot processes.” Mail-in ballots and the role of the Postal Service came under great scrutiny during the 2020 election.

An Associated Press review of potential cases of voter fraud in six battleground states found no evidence of widespread fraud that could change the outcome of the election. A separate AP review of drop boxes used for mailed ballots also found no significant problems.

The need for election worker protections was front and center at a separate hearing Wednesday of the House Committee on Homeland Security. Election officials and experts testified that a rise in threats of physical violence is contributing to staffing shortages across the country and a loss of experience at local boards of elections.

“The impact is widespread,” said Neal Kelley, a former registrar of voters in Orange County, California, who now chairs the Committee for Safe and Secure Elections. “And, while the effects on individuals are devastating, the potential blow to democracy should not be dismissed.”

Elizabeth Howard, senior counsel at the Brennan Center for Justice, told the committee that Congress needs to direct more money and support toward protecting election workers’ personal safety, including by funding local and federal training programs and providing grants to enhance security at election directors’ personal residences.

Democratic New Mexico Secretary of State Maggie Toulouse Oliver, who recently reported a series of threats, told the panel the situation has become worse after former President Donald Trump’s attacks against the 2020 election result.

“Unfortunately, we are still on a daily basis, in my state and across the country, living with the reverberating effects of the ‘Big Lie’ from 2020,” she said. “And, as we all know, when it comes to leadership, what you say from the very highest echelons of government power in this country do have those reverberating effects.”

Some Republican members of the committee condemned violence against election workers — and also drew a parallel to recent threats and intimidation directed toward some Supreme Court justices after their decision to overturn constitutional protections for abortion.

GOP Rep. Clay Higgins of Louisiana rejected the notion that Trump and other election skeptics were solely responsible for the “atmosphere of mistrust” that grew up around the 2020 election.