President Trump might be going to bat for Bernie Sanders in public -- but behind closed doors in L.A. ... he mocked the Vermont Senator as a "crazy" socialist he can easily beat. DT was in the City of Angels Tuesday for what's been reported as a series of fundraisers and talks about the 2028 Olympics, which are set to take place in L.A. After arriving in town, Trump held a private dinner for donors at the Montage hotel in Beverly Hills.