Mitch McConnell was first elected to the Senate in 1984, but he didn’t come to national prominence until the Obama Presidency, when, as the Senate Majority Leader, he emerged as one of the Administration’s most unyielding and effective legislative opponents. In the past three years, McConnell has put his political skills to work in support of Donald Trump’s agenda, despite the lasting damage that his maneuvering is doing to the Senate and to American democracy. Jane Mayer joins Dorothy Wickenden to discuss how and why McConnell, who faces reëlection this year, became one of Trump’s staunchest allies.