CNN deep dive:

Voting experts and political strategists from across the political spectrum are increasingly alarmed about the potential for a disputed presidential election in November, one in which one candidate openly questions the legitimacy of the results or even refuses to concede.

These experts are keenly aware of President Donald Trump’s well-documented history of lying about voter fraud and claiming that elections were “rigged” when he doesn’t like the outcome. They also see a Democratic base that is still burned from 2016, when its nominee was dragged down in part by Russian meddling operation, won the popular vote, and lost to Trump.

Interviews with nearly 20 election experts, former lawmakers, political strategists, legal scholars and historians indicate there are widespread fears of a nightmare scenario in November, where Trump’s norm-breaking behavior — coupled with the unprecedented challenges of pandemic-era voting — test the limits of American democracy and plunge the country into a constitutional crisis.”

There’s a significant scope for an unprecedented post-election crisis in this country,” said Larry Diamond, an expert on democratic institutions at the conservative-leaning Hoover Institution.