We start out by taking a look at the results of the new NPR/PBS NewsHour/Marist Poll that was released Friday. The majority of Americans believe that Trump has either done something illegal or unethical. Republicans, on the other hand, still have a very favorable impression of Trump.

It means he still likely has the inside line to the nomination, but other data in the poll suggests he would have a very tough time winning the general election if it were held today.

While this is all uncharted territory, Nixon and Watergate does offer some parallels, including strong Republican support to the bitter end.