By accident or design, Trump successfully spun the narrative after the Mueller investigation concluded with his "no collusion, no obstruction" one-liner sound bite. Of course, that was a lie, but the narrative worked in his favor.
With impeachment looming, however, Trump is flailing. He's tried to claim it's "a witch hunt" but that's a tired, recycled theme from when he was attacking the Mueller investigation.
He's also tried to claim it's all a conspiracy cooked up because Democrats are still sore they lost the 2016 election. That, too, is shopworn goods recycled from past sound bite battles.
His most laughable attempt is the claim the impeachment investigation is unconstitutional when everyone who's had civics knows the House alone sets all the rules for an impeachment.
The steady drip-drip-drip of new revelations, many which have disproven Trump's recent lies, certainly doesn't help. And there's much more damage to come with further witnesses behind closed doors being deposed and then public hearings coming in November, to be followed by the actual removal trial in the Senate.
So rather than sounding like the master communicator he sometimes is — again by accident or design — of late he's been sounding positively Nixonian. Which is another way to say "panicked" and "desperate."