Watch NBC Nightly News with Lester Holt every Tuesday for our Snapshot – unique stories of talented and passionate Americans. | NBC Nightly News with Tom Llamas

The world is on alert as Iran vows to retaliate against the U.S. for the death of Qassem Soleimani. Lester Holt went to Iran a few months ago, and interviewed top government officials about tensions with the U.S. More on NBC Nightly News with Lester Holt at 6:30 p.m. ET / 5:30 p.m. CT. | NBC Nightly News with Tom Llamas

Bernie Sanders on Mike Bloomberg: "I got a real problem with multi-billionaires literally buying elections." More of Sanders' interview with Lester Holt plus full coverage of #NHprimary2020, tonight on NBC Nightly News with Lester Holt. | NBC Nightly News with Tom Llamas