John Bolton
Former National Security advisor John Bolton.
  • John Bolton criticized Vivek Ramaswamy and Donald Trump over recent comments regarding Ukraine.
  • Bolton pushed back against Ramaswamy's idea to cede territory in eastern Ukraine to Russia.
  • "He has very firm opinions on subjects he knows absolutely nothing about," Bolton told CNN.

Former National Security Advisor John Bolton on Tuesday blasted Vivek Ramaswamy over the GOP presidential contender's idea to cede territory in eastern Ukraine to Russia in exchange for Moscow agreeing to sever their military alliance with Beijing, comparing the candidate unfavorably to his onetime boss, former President Donald Trump.