On Thursday, the justices will hear arguments in Trump’s appeal of a Colorado Supreme Court ruling that he is not eligible to run again for president because he violated a provision in the 14th Amendment preventing those who “engaged in insurrection” from holding office.

Many legal observers expect the nation’s highest court will reverse the Colorado ruling rather than remove the leading contender for the Republican presidential nomination from the ballot. But it’s always tricky to try to predict a Supreme Court ruling, and the case against Trump has already broken new legal ground.

Some of the main issues involved in the 14th Amendment case:

• What did Trump potentially violate?
• Trump’s defence
• Other Trump arguments