Laura King President Trump insisted Sunday that he’s unconcerned by reports that White House Counsel Don McGahn has cooperated extensively with special counsel Robert S. Mueller III’s probe into possible Russian collusion and obstruction of justice. The president said on Twitter that McGahn was not a “rat” and added, “I have nothing to hide.” The president’s latest series of disparaging tweets came at what may be a pivotal point in the investigation into Russia’s election interference, possible Trump campaign complicity and any obstruction of justice. The New York Times reported Saturday that McGahn had voluntarily given some 30 hours of interviews to Mueller’s team, acting in part on fears that Trump would try to shift the blame to him for any wrongdoing. Trump, spending the weekend at his New Jersey golf resort, said he was not worried about whatever McGahn had told investigators, adding he had authorized his aides’ cooperation with the special counsel.