President Donald Trump on Friday denied his former personal attorney Michael Cohen's claim that he knew in advance about a highly controversial 2016 Trump Tower meeting, the latest public breach in the fraying relationship between the President and his former confidant. "(No,) I did NOT know of the meeting with my son, Don jr." Trump wrote as part of a series of tweets Friday morning. "Sounds to me like someone is trying to make up stories in order to get himself out of an unrelated jam (Taxi cabs maybe?)." Cohen claims that then-candidate Trump had advance notice of the June 2016 meeting in Trump Tower involving Donald Trump Jr. and is willing to assert that claim to special counsel Robert Mueller. The meeting was premised on the expectation that Russians would offer campaign dirt on Hillary Clinton, and it's become a key focus of Mueller's probe into Russian meddling in the 2016 election and whether the Trump campaign coordinated with Moscow. US intelligence agencies say Russia interfered to support Trump's candidacy. According to sources, Cohen alleges that he was present, along with several others, when Trump was informed by his son about the Russians' offer and Trump gave his approval to go ahead with the meeting. The sources said Cohen does not have evidence, such as audio recordings, to corroborate his claim, but he is willing to attest to his account. The meeting at Trump Tower -- which was attended by Trump Jr., his brother-in-law Jared Kushner and then-campaign chairman Paul Manafort -- was first publicly revealed in news reports in July 2017, and Trump, his lawyers and allies have since offered misleading explanations and changing narratives about it.