If true, and this is a big "if", we will know soon enough. The authorities will need to be extremely careful how this is disseminated.
“Officials within the Trump White House believe leaks of Mr. Trump’s conversation with Russian Foreign Minister Sergey Lavrov are a ‘deliberate attempt’ by officials who are holdovers from President Obama’s administration and are trying to damage the Trump presidency.”
It will be spun and politicized instantly. The "leaks" will no longer be the story.