What Trump is doing goes way beyond merely being silent because you don't want to rock the boat of your own side, it is being silent in a case where a foreign power may have sway over the most important office in the country, where there is potential for treason, where the credibility of the office and country is being systematically destroyed and where there is reason to believe there is widespread corruption and criminal activities. At some point, if you have any integrity, you must call out people on your own side for wrong doing. Republicans seems unable to do this.