With nearly a decade on the national political stage, for some of the youngest eligible conservative voters this year, former President Donald Trump has been pivotal in their political upbringing.

Other democracies, from Europe to South America to the Middle East, have prosecuted their current or former leaders. Why did the U.S. wait so long to take that step? A political scientist weighs in.

World leaders are expressing their sympathies for the victims of the 9/11 attacks. British Prime Minister Boris Johnson says the terrorists had failed to "shake our belief in freedom and democracy."

The dynamics on display between the leaders can give clues on relationships and the status of talks on the world's weightiest issues.

Historians in Italy compare Wednesday's events to the rise of fascism. "Violence is incompatible with the exercise of democratic rights and freedoms," Italian Prime Minister Giuseppe Conte said.

President Trump counts several world leaders as his fans, many of them authoritarians, nationalists or populists. Some may struggle to stay as friendly with the White House if he loses the election.