I figured it was to "get out in front of the story" because the investigators would've released that information soon and it would've looked worse had they done that.
But, now Trump has stated that Giuliani didn't know what he was talking about, that he hasn't been around long enough to understand the situation (said that he started yesterday, eventhough he started on April 20th).
^^^This is what it looks like when you weave lies and you can't get out.