Desperate candidates say desperate things and Jeb Bush is desperate. His attacks on Marco Rubio have been dismissed and debunked by our own Senator Grassley. The fact. Marco Rubio has attended more classified national security briefings this year than any other candidate. The truth. He's a recognized foreign policy expert who will keep Americans safe Marco Rubio the conservative most feared by Hillary Clinton and Jeb Bush. Conservative Solutions PAC is responsible for the content of this advertising.