I think that there are two different groups investigating collusion and obstruction of justice. Collusion in itself is not a crime (it does not refer to a specific kind of crime or criminal activity). 1) Mueller's Independent investigation 'through' the FBI. 2) Congressional Committee investigation. Mueller will _not_ subpoena Trump "to appear before the committee." The Committee has its own subpoenas, but the President and the executive branch can ignore them, because the Committee is legislative, and the branches of government are separate branches of government not accountable to each other, other than what is stipulated in the Constitution. Pence has refused a congressional "invite."
Bill Clinton was obligated by law to testify under oath because of Paula Jones sexual harassment case, so yes I believe that Donald Trump would be obligated to testify, probably under oath. Clinton btw did not get in trouble because he did not keep his pants on, but rather because he perjured himself under oath. It is a very dangerous position for the President to be answering questions under oath from an independent investigation. I don't know what would happen if he refused, he has said he would answer, but let's wait until we get to that bridge, before we try to cross it.
Trump and his lawyers would like the questions in advance, I do not know of any good reason for them to be presented that way by Mueller.
I imagine that if Trump refused to testify, or declines to appear, than it would become pretty clear that Donald Trump would be "obstructing justice," which is something he wants to avoid.
Bill Clinton lied to the independent investigation, was charged with perjury and was impeached by a (Republican) Senate. I seem to remember he was not removed because the House had become Democrat at that point, although I am not sure about the details. So, yes there are ramifications for lying to an FBI investigation. But if the Senate stays Republican, they're probably not going to impeach a Republican President (even if it is Donald Trump).
I don't think the US Marshalls enter the picture anywhere.....
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