Biden and Ukraine
The whole Ukrainegate started because Joe Biden is caught on tape, admitting he did a criminal act, by threatening Ukraine to fire a prosecutor which stopped a criminal investigation into his son, or he'd withhold $1B in U.S. aid. Ukraine fired that prosecutor, ended that investigation, and funneled $millions to his Son's company (and ultimately his Son. Who had no prior experience, and yet was hired and paid millions in bonuses for this fortuitous coincidence or payola). Multiple media outlets at the time noted it, but had little curiosity about investigative journalism (and the conflict of interest) or pushing this further.