 The Romney campaign was reported to have asked him to resign his governorship if he became the vice-presidential nominee because "pay to play" laws restrict campaign contributions from financial corporation executives to governors running for federal office when the companies do business with the governor's state.A memo from the campaign attributed Romney's decision not to choose Christie as his running mate, in part, to unanswered questions during the vetting process regarding a defamation lawsuit following Christie's initial campaign for Morris County Freeholder, a Securities and Exchange Commission investigation of Christie's brother, as well as his weight.Christie gave the keynote address at the Republican National Convention in August 2012.