Former US president Donald Trump is barred from returning to the White House, say some opponents who argue his role in the January 6th, 2021, Capitol attack amounts to supporting an "insurrection" as defined by the 14th Amendment of the US Constitution.
Here's a look at the legal theory and its long-shot chances of blocking the front-runner for the Republican presidential nomination from the November 2024 ballot.
How could Trump be disqualified?
Some legal experts say Mr Trump’s January 6th actions disqualify him for the presidency. They cite his fiery speech to supporters who then stormed the Capitol in a failed bid to stop Congress from certifying Democratic president Joe Biden's election.
They cite Section 3 of the post-Civil War 14th Amendment, which bars government officials who have "engaged in insurrection or rebellion" from holding office.
Advocacy group Citizens for Responsibility and Ethics in Washington filed a lawsuit in Colorado on September 6th seeking to bar the state’s top election official from placing Mr Trump on the ballot in the November 2024 election, citing Section 3.
More lawsuits against state election officials could follow, inviting a legal melee across all 50 states over a largely untested legal question with potentially broad implications for who is permitted to hold federal office.
Has Trump been convicted of inciting the insurrection?
The US House of Representatives in Mr Trump's second impeachment charged him with inciting an insurrection on January 6th, but Senate Republicans narrowly sustained enough votes to acquit him.
He is now awaiting trial on four criminal indictments, including two related to his efforts to overturn his 2020 defeat, which he falsely claims was the result of fraud.
Mr Trump has not been charged with insurrection or rebellion.
Some legal experts say efforts to disqualify Mr Trump could set a troubling precedent that would empower state election officials to unilaterally disqualify candidates based on their own interpretations of "insurrection or rebellion".
Disqualifying candidates based on crimes they have not been convicted of, or even charged with, could run afoul of their rights to due process and equal protection, which are also enshrined in the 14th Amendment.
How would disqualification work?
Section 3 has no clear enforcement mechanism. Some legal scholars say it would require an act of Congress to put it into effect. Others say state election officials are bound to apply it when considering candidates for the ballot and can be compelled to do so by court order.
Voters and groups representing them would need to persuade secretaries of state across the 50 states - many of them elected Republicans and Trump allies - to determine Mr Trump is disqualified or to persuade judges to bar them from putting Mr Trump on the ballot.
For the manoeuvre to succeed, its proponents would need to persuade officials in enough Republican-leaning states to block Mr Trump from the ballot that he would be denied the 270 Electoral College votes needed for victory.
Those efforts would almost certainly draw legal challenges from Republicans.
Has it ever been done before?
Section 3 was used to disqualify numerous people from office following the 1861-1865 US Civil War but has since been almost entirely dormant.
In September 2022, however, the same advocacy group that sued to keep Mr Trump off the ballot in Colorado persuaded a New Mexico judge to remove a county commissioner from office over his participation in the January 6th insurrection.
Could it work?
The effort faces long odds. It would require persuading or forcing election officials to keep Mr Trump off the ballot in states governed by his Republican allies.
It could also invite a legal battle of epic proportions, which would ultimately be decided by a US Supreme Court dominated by a 6-3 conservative majority including three Trump appointees.
Has the 14th amendment been in the news lately?
During a showdown with House Republicans over the nation's $31.4 trillion debt ceiling, Mr Biden in May floated the idea of using Section 4 of the 14th Amendment to unilaterally raise the debt limit, but he never carried out that threat.
There were also legal questions about how successful that manoeuvre would have been.
