Obama had to spy on Trump to protect himself. Trump had nothing to do with it. Manafort has been under investigation since 2014, well before your Trumpty simpleton announced his candidacy for president. If he was caught talking to Manafort and somehow incriminated himself, that's his problem. http://www.slate.com/blogs/the_slatest/2017/09/18/paul_manafort_reportedly_under_fbi_surveillance_from_2014_until_this_year.html