News Mueller’s office seeks prison sentence of 20 years or more for ex-Trump campaign chairman Paul Manafort February 15, 2019Kevin Johnson and Bart Jansen, USA TODAYComments Off on Mueller’s office seeks prison sentence of 20 years or more for ex-Trump campaign chairman Paul Manafort President Donald Trump's onetime campaign chairman was found guilty of tax and bank fraud charges. Prosecutors are seeking a lengthy prison sentence.