A top adviser to Donald Trump has warned the Republican Party of severe consequences should they mistreat the leading GOP candidate or support developing efforts to take him down.

Trump's special counsel, Michael Cohen, described a former Republican National Committee employee's recent resolve to end the billionaire's candidacy as a "bad bad decision" during an interview with CNN Tuesday.

"It changes everything," Cohen told CNN's Chris Cuomo.

Despite the anti-Trump effort being led by outside groups, Trump's lawyer said the RNC will still be held responsible.

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