Trump speech roils CPAC Marco Rubio's supporters protest appearance by the GOP front-runner, who has donated more than $100,000 to the event's host. By Kenneth P. Vogel 03/02/16 07:10 PM EST Updated 03/02/16 11:16 PM EST Donald TrumpÂ’s speaking slot at the Conservative Political Action Conference on Saturday is prompting an acrimonious backlash from the conservative critics desperately trying to mount a last-ditch campaign to block the GOP presidential front-runner from winning the partyÂ’s nomination. A top aide to Trump rival Marco Rubio has accused CPAC organizers of being in the tank for Trump and clearing the way for his...