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

Here's a look at the key headlines.

1. Trump, Cruz Work to Block Kasich From Ballot

The Donald Trump and Ted Cruz campaigns are working to prevent John Kasich from appearing on the ballot at the Republican National Convention in July — an aggressive strategy suggesting the GOP's leading candidates are girding for a contested convention to select the party's nominee. While Trump and Cruz are locked in a bitter battle, aides to both men tell MSNBC it's in their mutual interest to keep Kasich off the ballot. The convention rules control who is on that ballot — and thus eligible to win the nomination. Read more in POLITICS.

2. Trump Would Sell Government Assets to Lower National Debt

As president, Donald Trump would sell off $16 trillion worth of U.S. government assets in order to fulfill his pledge to eliminate the national debt in eight years, senior adviser Barry Bennett said. "We can get rid of government buildings we're not using, we can extract the energy from government lands, we can do all kinds of things to extract value from the assets that we hold," Bennett told MSNBC's Chris Jansing on Sunday. Read more in POLITICS.

3. Amtrak Train Derailment Near Philly Leaves 2 Dead, 35 Injured

Two people were killed and 35 others were injured Sunday morning when an Amtrak train struck a backhoe and derailed south of Philadelphia while traveling from New York to Savannah, Georgia, authorities said. Sen. Chuck Schumer, D-New York, said at a news conference that he was told by Amtrak that the workers who were killed were the backhoe's operator and a supervisor, both of whom worked for Amtrak. Read more in NEWS.

4. Second Batch of Spring Snow to Blanket Northeast

Millions of Americans were under winter weather advisories Monday morning, bracing for a second batch of spring snow as crews worked to dig out from the weekend's deadly storm. More than 9 inches of snow fell in Michigan while parts of Massachusetts, Connecticut and Rhode Island saw up to 6 inches of snow on Sunday, while deadly, heavy winds battered swaths of the country Sunday. Read more in WEATHER.

5. Greece Begins Migrant Deportations Under Controversial EU Plan

Officials on the Greek islands of Lesbos and Chios deported 202 migrants and refugees on boats bound for Turkey on Monday. The group were the first to be sent back to Pakistan and Syria as part of a controversial European Union plan to limit the amount of migration to Europe. Read more in NEWS.

6. Revered Indian Leader Joe Medicine Crow Dies at 102

Joe Medicine Crow, the respected historian of Montana's Crow Tribe and the last surviving Plains Indian war chief, died Sunday at age 102, Montana Gov. Steve Bullock said. Medicine Crow was the sole surviving Plains war chief, an honor that was bestowed for his heroism during World War II. Read more in NEWS.

7. U.S. Infrastructure Can Be Hacked With Simple Passwords

Authorities say the Iranian computer hack of a New York dam is the symptom of a huge weakness in the U.S. infrastructure -- dams, stadiums, traffic controls and power grids that can be accessed by anyone, including hostile nations or terrorists -- with simple passwords or no passwords at all. Authorities are worried about these attacks because the threat is growing exponentially, and despite years of warnings America's private sector has been woefully slow to adapt. Read more in NEWS.

Nightly Spotlight: ‘Heroin Safe Zone’ Permits Users to Shoot Up

There’s a radical approach to the growing heroin epidemic: a site where medically supervised injection is actually allowed.