President Donald Trump. Getty Images/Pool President Donald Trump's defense team is arguing that Trump cannot be charged with collusion or obstruction of justice — the central threads of the special counsel's Russia investigation. Two of Trump's key defense lawyers, John Dowd and Jay Sekulow, have said in recent days that collusion is not a crime and that Trump as president cannot be guilty of obstruction because he "has every right to express his view of any case." Legal experts have pushed back on the claims, saying that Trump's lawyers are ignoring the crux of the obstruction case and that he could be found guilty of crimes resulting from collusion. President Donald Trump's legal defense team is adopting a bold new strategy as the Russia investigation reaches a boiling point: arguing that a sitting president can't obstruct justice. The president "cannot obstruct justice because he is the chief law enforcement officer" under Article II of the Constitution "and has every right to express his view of any case," Trump's lawyer John Dowd told the news website Axios. The comment seems to confirm previous reports that Trump's legal team was working over the summer to convince the special counsel Robert Mueller that Trump can't be found guilty of obstruction because he has the constitutional authority to fire whomever he wants. The question of whether Trump tried to impede an ongoing FBI investigation reemerged on Saturday when he tweeted a potentially incriminating claim. The day before, his former national security adviser, Michael Flynn, pleaded guilty to lying to the FBI about his conversations with Russia's ambassador. "I had to fire General Flynn because he lied to the Vice President and the FBI," Trump said. "He has pled guilty to those lies. It is a shame because his actions during the transition were lawful. There was nothing to hide!" Dowd told Axios that the claim that the tweet was an admission of obstruction was "ignorant and arrogant." But if Trump knew Flynn was in the FBI's crosshairs when, one day after Flynn resigned, Trump asked the FBI Director James Comey, whom he later fired, to consider dropping the bureau's investigation into Flynn,