. >> sunday on q&a -- last pressxon's conference. he would win a 49 state landslide -- it all came apart. pat buchanan served as a speechwriter and senior adviser for president nixon. he discusses his book. saying ie him a memo think you want to testify -- you will have to keep the five tapes dean --ersations with b you really should take. and shut down this special prosecutor's office now before it grows into a monster. fred and called in entertained this idea that he should burn the tapes. he said it would be obstruction of justice. i did and recommend burning subpoenaed tapes. there was executive privilege. myrecently got rid of them think he would have moved right through it. president nick's and said in his memoirs if he had burned the tapes, he would have survived. i think that is right. -- president nixon said in his memoirs. war,night on the civil historians discuss new york city during the civil war from divided political loyalties in the union state to its southern economic ties. there is a preview. -- here is a preview. >>