paul is already under fire for his evolving views on iran , foreign aid to israel and defense spending .
why do n't we let me explain instead of talking over me , ok ? ' he asked the ` today ' host as she tried to corner him .
paul launched his presidential quest on tuesday in kentucky andis already on a five-state campaign swing .
he pinned his 2007 claim that iran was not a threat to the us on the fact that he was campaigning for his father 's presidential bid at the time .