Lewis Hamilton on Friday welcomed the FIA's intervention to overcome 'porpoising' on health and safety grounds and said any steps taken were unlikely to affect the grid for Sunday's Canadian Grand Prix. The seven-time champion's comments came after world champion and current leader Max Verstappen said he opposed the introduction of any mid-season rule changes. The governing International Motoring Federation (FIA) said on Thursday it would take steps to beat the phenomenon that has left many drivers suffering severe back pain this season.