Racial slur, alleged threat to 'execute' man: Watch most outrageous moments from this Dem Senate candidate

The Democrat frontrunner in one of this year's top Senate races is no stranger to controversy.

Rep. David Trone – who is running to replace retiring Sen. Ben Cardin in Maryland and faces a tough primary challenge on Tuesday – has frequently been caught making some truly wild statements, both as a candidate and member of Congress, as well as while working in the private sector.

From using a racial slur, to allegedly threatening to "execute" someone, here are five of Trone's wackiest...