KNOW IT ALL: Tuesday's Top Stories at NBC News

Image: Fort McMurray Wildfire
In this image released by the Alberta Royal Canadian Mounted Police (RCMP), members of the RCMP monitor the Fort McMurray Wildfire, on May 7, 2016 in Fort McMurray, Canada.Alberta RCMP via AFP - Getty Images

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

1. Who Can Beat Trump — Clinton or Sanders?

Hillary Clinton holds a 12-point lead over Bernie Sanders nationally, but in a hypothetical match-up against Donald Trump, Sanders does much better than the current Democratic front-runner. Though about a month remains until the last Democratic primary, Sanders trails Clinton by a significant number of delegates, making Clinton the strong favorite to win the nomination. The data from the hypothetical head-to-heads thus provides a window into which groups Clinton needs to sway in order to defeat Trump in the general election in November. Read more in POLITICS.

2. Knife Attacker Kills 1, Stabs Others at German Train Station

A man armed with a knife killed one person and wounded at least three others in a dawn attack at a train station near Munich early Tuesday, officials said. Police are investigating witness reports that the suspect shouted "Allahu Akbar" — Arabic for "God is great." A 27-year-old German national who was born in the country was arrested shortly after the incident in Grafing. According to authorities, he was armed with a four-inch knife. Read more in NEWS.

3. DOJ Files Lawsuit Challenging N.C. Bathroom Law

The Department of Justice has filed its own lawsuit and upped the ante in a fight between the federal government and North Carolina's governor in the legal battle over the state's law regarding access to bathrooms. In the suit, the Justice Department said the law "stigmatizes and singles out transgender employees, results in their isolation and exclusion, and perpetuates a sense that they are not worthy of equal treatment and respect." The state's Gov. Pat McCrory turned up the heat earlier Monday and filed a lawsuit against the federal government. Read more in NEWS.

4. Two Killed as Violent Storms Sweep Across Plains

A storm system that killed at least two people in Oklahoma and spawned reports of more than 20 possible tornadoes tore into Arkansas overnight. An elderly man was one of two people who died when storms hit south-central Oklahoma on Monday, authorities told NBC News. The "large and extremely dangerous" tornado also trapped six people under debris south of the town of Wynnewood in Garvin County. Read more in WEATHER.

5. 'Trump' of Philippines Wins Presidential Election

Rodrigo Duterte, the bombastic mayor of a major southern city, was heralded Tuesday as president-elect of the Philippines after an incendiary and populist campaign. Known for his off-color sexual remarks and pledges to kill criminal suspects, the results thrust Duterte into national politics after 22 years as mayor of Davao and a government prosecutor before that. Read more in NEWS.

6. Panama Papers: Database Released, Dozens of Americans Listed

The "Panama Papers" database went live and searchable Monday, stripping the veil of secrecy from thousands of offshore shell companies and the people who have used them to launder money, hide evidence of crimes, and keep income from the taxman. The database includes information on dozens of Americans tied to financial misconduct. Read more in NEWS.

7. Ferguson's First Black Police Chief Sworn In

Veteran Florida cop Maj. Delrish Moss was sworn in as new Chief of Police in Ferguson, Missouri on Monday. He will be the first African American to lead the department. Moss, will replace former Chief of Police Tom Jackson. Jackson resigned on March 11, 2015, right after the Department of Justice released a scorching 102-page report on the Ferguson Police Department that detailed rampant systematic racial bias and Constitutional violations undertaken by members the department and the city's judicial system. Read more in NEWS.

Nightly Spotlight: Stunned Leaders Get First Looks at Alberta Fire Devastation

Regional leaders and journalists got their first close-up look Monday at the cataclysmic landscape left behind by the raging wildfire in Alberta. The tour revealed a blackened, charred moonscape of smoky ruins, damage so stark that Intact Financial, Canada's largest insurer, called "unprecedented."