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KNOW IT ALL: Monday's Top 7 Stories at NBC News

Clinton goes after Trump and Romney campaigns with Kasich, see the stories we're following today.
Image: Hillary Clinton Attends Democratic Town Hall Held In Columbus, Ohio
Democratic presidential candidate former Secretary of State Hillary Clinton speaks during the CNN - TV One Town Hall on March 13, 2016 in Columbus, Ohio. Hillary Clinton is campaigning in Ohio ahead of Tuesday's primary. Justin Sullivan / Getty Images

Good morning. Here are some of the headlines we're following today:

1. Here's What Trump Supporters Think of Rally Violence

It can get worse. That's the sinking feeling hanging over Donald Trump rallies amid mounting confrontations between supporters and protesters — accompanied by ever-escalating rhetoric from the candidate himself. Read more in POLITICS.

2. Breitbart Reporters Resign After Alleged Assault by Trump Staffer

Breitbart reporter Michelle Fields has resigned from the conservative news site over its response to her alleged assault by Donald Trump's campaign manager. Her colleague, Ben Shapiro, also resigned from the site, saying it should be "ashamed" of the way it treated Fields, whose allegations of assault came amid escalating violence in and around Trump campaign events. Read more in NEWS.

3. Lessons of Teaneck: A Town's Journey to Redemption

The 16-year-old victim was black. The officer was white. And that gunshot, fired nearly 26 years ago, sparked a cataclysm. But the aftershock also opened a long path to healing that remains relevant today, as a wave of unrest over police killings has swept the country, cleaving communities and raising thorny questions about America's relationship with law enforcement. Read more in NEWS.

4. Twenty Hurt After Amtrak Train Derails in Kansas

Around 20 people were hospitalized after five coaches of an Amtrak train partially derailed 20 miles west of Dodge City, Kansas, while traveling from Los Angeles to Chicago early Monday, officials said. Read more in NEWS.

5. Romney to Campaign with Kasich in Ohio

Mitt Romney will campaign with John Kasich on Monday at two stops in Ohio. Romney is expected to appear with Kasich at his events in Canton and outside Columbus on Monday afternoon. The campaign stops come a day before the crucial Ohio primary, a must-win for Kasich, as Donald Trump ups his attacks on the sitting governor. Read more in POLITICS.

6. Flood Problems Just Beginning as Rain Moves Past South

The thunderstorms that killed six people and flooded thousands more out of their homes in the South got in one last kick Sunday before clearing out overnight, but major river flooding is expected to continue for many days, forecasters said. Read more in NEWS.

7. Richard Simmons Speaks Out: 'I Am Not Kidnapped'

Richard Simmons, who has largely stayed out of the public eye since a 2014 knee injury, had to clarify Sunday that he was not kidnapped following a report in the New York Daily News suggesting he might be held against his will in a Hollywood Hills mansion. "No one should be worried about me," the fitness guru said. Read more in POP CULTURE.

Nightly Spotlight: Young Hospital Patients Experience Virtual Reality

Some of the hottest technology is transporting hospitalized kids into places they’d otherwise never be able to see.