"Now the country is faced with a president whose conduct strongly suggests that he poses a danger to our system of government. ...[I]mpeachable offenses could theoretically have been charged from the outset of this presidency. ...One important example is Trump’s brazen defiance of the ...The question of Russian interference in the presidential election and possible collusion with the Trump campaign go to the heart of our system and ability to conduct free and fair elections. ...[R]eporting suggests... the... sinister, with Trump insisting that Comey pledge "loyalty" to him in order to retain his job... the president turned to Twitter with a none-too-subtle threat that Comey would regret any decision to disseminate his... conversations... Nixon’s... list of actions... deemed... impeachable obstruction reads like a forecast of... Trump... misleading statements to, or withholding material evidence from, federal investigators or... employees; trying to interfere with FBI or congressional investigations; trying to break through the FBI’s shield surrounding ongoing criminal investigations... [T]he crucial thing is that the prospect now be taken seriously, that the machinery of removal be reactivated, and that the need to use it become the focus of political discourse..."