Comey is testifying publicly. Trump is hiding behind his Twitter account. Who's the coward?

From "Alice in Wonderland" to Washington D.C. ~ Trump, both Tweet-tle Dee and Tweet-tle Dum

With every tweet he toots, I step more and more away from him. It is probably unfair of me, I admit it, but I find his constant tweeting unprofessional, childish and tacky.