A former top adviser to Donald Trump has launched a pro-Trump Super PAC to attack Republican rivals, specifically competitor Marco Rubio, who has quickly become one of Trump’s most threatening rivals in the 2016 presidential race.

Roger Stone, a leading Republican operative who earlier this year cut ties with the official Trump campaign, launched the Committee to Restore America’s Greatness, borrowing the language from Trump’s Reagan-era slogan, “Make America Great Again.”

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