Supporters of the Texas congressman, who is contemplating a 2012 White House bid, have tussled with the real estate mogul/presidential hopeful before, notably over whether Paul could get elected president.

The complaint by Shawn Michael Thompson stems from the recent visit by Trump Executive Vice President Michael Cohen, who flew on Trump's jet to Des Moines. Thompson alleges in his complaint that the plane trip violates campaign-finance law because Trump hasn't filed the necessary paperwork to show that he is officially testing the waters for the presidency.