2. Nixon was a lame-duck president; Trump’s definitely not. When the buzzards began circling Richard Nixon’s presidency, he was well into his second term, and faced a Democratic-controlled Congress that was not about to let him off the hook for any Watergate-related revelations. By the time definitive evidence of obstruction of justice emerged, the House was already considering articles of impeachment, and Democrats held 56 Senate seats. Trump is already running for reelection in what bids fair to become a savagely polarized 2020 campaign, and his party controls the Senate and thus can make (and almost certainly already has made) his removal from office via the impeachment process all but impossible. To the extent that Trump’s entire presidency is the product of some of the most intense partisanship in living memory, and his entire personality is based on his identity as a “winner,” the odds of him ever resigning in the face of attacks from Democrats seem very low. And Republicans know that.