Oh, with regards to the above, and Trump's tweets asking the committee to ask Yates about the leaks, and reports that the White House contacted multiple Republican senators asking them to cancel the hearing:
18 U.S. Code, Section 1512 (b):
(b) Whoever knowingly uses intimidation, threatens, or corruptly persuades another person, or attempts to do so, or engages in misleading conduct toward another person, with intent to—
(1) influence, delay, or prevent the testimony of any person in an official proceeding;
(2) cause or induce any person to—
(A) withhold testimony, or withhold a record, document, or other object, from an official proceeding;
(B) alter, destroy, mutilate, or conceal an object with intent to impair the object’s integrity or availability for use in an official proceeding;
(C) evade legal process summoning that person to appear as a witness, or to produce a record, document, or other object, in an official proceeding; or
(D) be absent from an official proceeding to which such person has been summoned by legal process; or
(3) hinder, delay, or prevent the communication to a law enforcement officer or judge of the United States of information relating to the commission or possible commission of a Federal offense or a violation of conditions of probation, supervised release, parole, or release pending judicial proceedings;
shall be fined under this title or imprisoned not more than 20 years, or both.http://www.law.cornell.edu/uscode/text/18/1512Just putting it out there......(thanks, Keith Olbermann!)