“Trump has already done more than enough to warrant impeachment and removal with his relentless attempts, on multiple fronts, to sabotage the counterintelligence and criminal investigation by then-special counsel Robert S. Mueller III and to conceal evidence of those attempts. ...

”The current whistleblowing allegations, however, are even worse. Unlike the allegations of conspiracy with Russia before the 2016 election, these concern Trump's actions as president, not as a private citizen, and his exercise of presidential powers over foreign policy with Ukraine. Moreover, with Russia, at least there was an attempt to get the facts through the Mueller investigation; here the White House is trying to shut down the entire inquiry from the start — depriving not just the American people, but even congressional intelligence committees, of necessary information.

“It is high time for Congress to do its duty, in the manner the framers intended. ... Congressional procrastination has probably emboldened Trump, and it risks emboldening future presidents who might turn out to be of his sorry ilk. To borrow John Dean's haunting Watergate-era metaphor once again, there is a cancer on the presidency, and cancers, if not removed, only grow.”

— George Conway and Neal Katyal, “Trump has done plenty to warrant impeachment. But the Ukraine allegations are over the top,” in The Washington Post