FILE - In this Feb. 19, 2020, file photo, from left, Democratic presidential candidates, former New York City Mayor Mike Bloomberg, Sen. Elizabeth Warren, D-Mass., Sen. Bernie Sanders, I-Vt., former Vice President Joe Biden, former South Bend Mayor Pete Buttigieg, Sen. Amy Klobuchar, D-Minn., participate in a Democratic presidential primary debate Wednesday, in Las Vegas, hosted by NBC News and MSNBC. The Democratic presidential contest has moved to immigrant-heavy Nevada, but the issues of immigration are seldom getting a thorough airing on the campaign trail. Candidates usually throw in a quick condemnation of President Donald Trump's hard-line policies but have shied away from outlining their own immigration positions. Immigration groups say that points to a potential vulnerability for whoever is the Democratic nominee later this year. (AP Photo/John Locher, File)

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