Yes, Kellyanne Conway and others who have been hired to work on Trump's campaign should try to defend their candidate. It's part of the job they've signed up for. It is difficult to defend many of his words and actions, but if anyone finds themselves unable to do so, they should quit their jobs.
No, no one should try to defend Trump's action because he is trying to ruin the democratic system with his failed campaign. Since he cannot get what he wants, he will not let anyone get what they want. He would rather take down our democracy than lose to a woman.
Over the past couple of weeks, Trump's behaviour has become so volatile and preposterous that his surrogates and defenders seem to feel compelled to make fools of themselves in front of the country justifying his remarks. It would far better for their own personal dignity if they allowed him to do his talking for himself without the support of others.
Donald Trump has made a mockery out of this country and its election process. You basically have a guy that doesn't really know how government works and how complicated the procedures are involving the election process and the hierarchy of power in this country and other countries. To be blunt, the man is just talking out of his ass and saying a lot of things that have absolutely no meaning but make sense to the ignorant because he uses big words and makes promises based off of stuff he overheard somewhere. To defend Trump's actions is like taking a giant piss on the American flag.