The 'Born in the USA' singer went on an anti-Trump tirade, and Kid Rock responded. So did President Trump. Here's what to know.

The 20-time Grammy winner recently opened his Land of Hope and Dreams tour by asking fans to "raise your voices against the authoritarianism and let freedom ring."

In another unfiltered rant, the president's missive included a veiled threat concerning the rocker's re-entry to the U.S.