. >> reporter: san francisco's city controller ben rosen field is talking about the city's new financial system which was launched july 1st. it replaces a two decade old system which all city departments used for requisitions, purchasing and other financial transactions. rosen field says most of the city's 6,000 users have gone through online training and there are support teams to help navigate the complicated system. >> we're getting about 300 help desk tickets a day. >> reporter: rosen field says that's about normal for a massive new program like this. though workers in some city agencies are apparently having trouble making purchases, saying they need more training. in may abc7 news reported the city's aging fleet of police cars are breaking down more frequently and to make matters worse there is a shortage of new cars to replace them. many are here at the city central repair shop towed here for maintenance and repairs. police union president marty hal ran is concerned that issues with the new financial system may exacerbate the existing problem. >> we have upwards of 50 cars that ar

physician and journalist elizabeth rosen tall examines the business side of health care in her book "american sickness" and nebraska senator ben sasse is interviewed about his book "pi the vanishing adult." >> this weekend on booktv on c-span2, saturday, at 11:00 p.m. eastern, pat buchanan talks about his book "nixon's white house wars" on his time as the former speech writer and senior adviser to president richard nixon. >> they were going to break nixon as they broke lyndon johnson, but at the end of the year, 1969, richard nixon, if you can believe it, was at 68% approval in the gallup poll and 19% disapproval. astonishing. and here is nixon seven years before had been written off as the biggest loser in american politics. >> sunday at 10:00 p.m. eastern, essayest and professor rocksan gay doeses her above and her body in the memoir "hunger" you sue a woman in her fat pants and saying i did that. and i want to write that book so why don't i tell the story of my body today. and without apology. just explanations. this is my fat body, and this is what it is like to be in this world in this body. >> for more on this weekend's