It is a bogus excuse to spy on President Donald Trump and find the tiniest, little, bitty reason to try and impeach him. If the FBI and DOJ were doing their jobs instead, of partisan Obama hacks trying to destroy the US from within, Democrats and RINOs would be charged and in jail already. Any other world leader, as long as it is not against the law will keep conversations with other world leaders classified and out of the ears of partisan hacks who would use any of those calls to slander you. One good way to prove there was no impropriety is to record all calls with other foreign leaders but, keep it classified. Anyone who is not even in the President's cabinet can get a court order to have the taped conversation made public if there is reasonable belief that a crime was committed. Even that is iffy as we already saw how the FISA warrant was abused and the guilty not even punished? Hell, the supposed impeachment witnesses were giving their so called suppositions on how the call went in an effort to slander President Donald Trump? This is treason no less.