Biden is preparing for a Bernie broadside at the first 2020 debate

Former Vice President Joe Biden is reportedly preparing for the first Democratic debate by boning up on old Sen. Bernie Sanders (I-Vt.) clips.

Biden and Sanders, the top two candidates in most Democratic primary polls, have been placed together in the second night of primary debates this week, and CNN reports the former vice president has been "viewing some of Sanders' exchanges with [Hillary] Clinton in 2016" and "trying to acquaint himself with Sanders' style."

Numerous campaign advisers who spoke with CNN said they're cautioning the candidates against directly attacking their fellow Democrats, and Sanders told CNN that he expects the debate to be "friendly" while promising that they'll be "debating the real issues facing the American people" and not getting "into personal controversy and gossip."

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That doesn't mean there will be no engagement between the candidates at all, though, as Sanders added that "we are going to be contrasting our views with other people." That should include Biden, who Sanders has taken some recent digs at, in April interview encouraging voters to "take a look at my record versus" the former vice president's. This possible confrontation between the race's two frontrunners is set for June 27.