Gary Lineker’s recent tweets about politicians appear to breach the BBC’s social media guidelines, the Government’s candidate for chairman of the corporation has said.The former England footballer recently hit back at Grant Shapps after the Defence Secretary questioned whether the Match Of The Day host should express political views.Lineker was among a group of celebrities to sign a letter calling for the Government to scrap its Rwanda scheme and for political leaders to come up with a “fair new plan for refugees”.