Let't take Manafort, who Trump dismisses as follows:

In the indictment, the Grand Jury states that Manafort received tens of millions of dollars from Ukrainian sources between 2006 and 2015.
Nowhere have I seen Trump, or a member of his administration, express shock, anger, betrayal or outrage that Trump's campaign manger was, for 10 years prior to his campaign, an unregistered agent for a kleptocracy involved in massive human rights abuses and corruption. Forget, for just a moment, the argument that there is no current 'complicity' (again a nebulous term). What does it say about the President of the United States that he could care less that his campaign manager was an unregistered foreign agent for a kleptocracy that was unashamedly Putin's Poodle?
And this is the part of the Manafort narrative I find so troubling: Here is a man who, for 10 years, is driven by greed and avarice, shuffling money from foreign accounts into properties in the United States, and then taking loans out on the properties. This is a man whose life is defined by self aggrandizement and self-dealing. This is Manafort's own daughter's portrait of her father:
In a series of texts reviewed by Business Insider that appear to have been sent by Andrea to her sister, Jessica, in March 2015, Andrea said their father had "no moral or legal compass."
"Don't fool yourself," Andrea wrote to her sister, according to the texts. "That money we have is blood money."
"You know he has killed people in Ukraine? Knowingly," she continued, according to the reviewed texts. "As a tactic to outrage the world and get focus on Ukraine. Remember when there were all those deaths taking place. A while back. About a year ago. Revolts and what not. Do you know whose strategy that was to cause that, to send those people out and get them slaughtered."
And yet suddenly, this man who is so consumed with personal greed and power, whose daughter says he has "no legal or moral compass", decides that he wants to be Trump's campaign manager FOR FREE? And in June 2016 Manfort offers to give campaign updates to a Russian Oligarch with close ties to Putin?
Do Trump and his supporters think that this amounts to nothing? When Reagan ran for President in 1980, his campaign manager was William Casey, soon to head of the CIA. If William Casey found out that someone on Reagan's staff was giving campaign updates to a hostile foreign power, what do you think he would do?
To paraphrase Gerald Ford, if Ronald Reagan were alive, he'd be rolling over in his grave.