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U.S. Code 1512 - tampering with a witness, victim or an informant applies to Cohen's sudden decision to withdraw from testimony. The most applicable part of the statute is this:
2) Whoever uses physical force or the threat of physical force against any person, or attempts to do so, with intent to—
(A) influence, delay, or prevent the testimony of any person in an official proceeding;
shall be punished as provided in paragraph (3).
the use or attempted use of physical force against any person;
imprisonment for not more than 30 years; and
in the case of the threat of use of physical force against any person, imprisonment for not more than 20 years.
As I see it, Trump could be liable for as much as 30 years in prison. If I were you, I would write to your congressman as soon as you can.