Former secretary of defense Jim Mattis told aides he would rather 'swallow acid' than allow Trump to throw a $50million 'Victory Parade', and said the president's summit with Putin was a display of the White House seeking 'instant gratification', a new book reveals. Mattis, who was known as 'Mad Dog' during his career in the military, resigned in December 2018 following Trump's decision to withdraw US troops from Syria. The defense chief's former speechwriter Guy Snodgrass has detailed his clashes with the president in new book, Holding The Line: Inside Trump's Pentagon With Secretary Mattis, obtained by DailyMail.com ahead of...