John Legend responds to Donald Trump Jr., burns 'RedKneckHillBilly'

John Legend responded to Donald Trump's son on Twitter and shot back at one of the Republican front-runner's supporters Friday night.

Shortly after hundreds of jubilant protesters successfully sabotaged the Republican presidential candidate's campaign rally, Trump's son, Donald Jr., took to Twitter.

He heard back from an unexpected voice, singer/songwriter John Legend.

Enter a Trump supporter under the moniker "RedKneckHillBilly" got involved.

Cue Legend.

Legend, and both Trumps, are graduates of the University of Pennsylvania.

Now ‘RedKneckHillBilly’ knows.