“Never Trump” political commentator Sarah Longwell urged Democrats on Saturday to consolidate the Democratic presidential primary field to prevent Sen. Bernie Sanders, I-Vt., from becoming the party’s nominee.

Longwell wants Democrats to heed the lessons of the 2016 Republican presidential primaries, saying that a crowded field deep into primary season is one of the most substantial reasons why the Republican Party ended with a Trump candidacy. She warned that if Sanders does become the Democratic nominee, President Trump will easily defeat him in 2020.

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