For a half-century, Donald Trump has portrayed himself as the consummate dealmaker - and the ultimate escape artist, a serial entrepreneur turned politician who managed to avoid major consequences despite having been investigated in every decade of his adult life by federal and state agencies, by bankers and casino regulators, by legions of prosecutors and competitors.

He's been investigated over matters small and huge: over alleged lobbying violations in New York state and whether he played a role in the Russian government's effort to interfere with the 2016 U.S. presidential election. He was the only president to be impeached twice, yet he was acquitted both times.