Sounds to me like everything was fine until he decided to send money to Trump...
Yes, notice though that in Trump’s case the donation wasn’t to get Trump elected, as Trump had already won and didn’t need the donations to win- whereas in Obama, Biden, and Hillary’s cases, and likely in every other case, the donations came while he could still affect the outcome of their elections because the politicians were still running. Those donations were intended to assist them to get elected, the donation to Trump had another purpose, maybe like a CYA memo. Sounds like Zubari’s donation to Trump was because Zubari either suspected he was already under investigation, or else feared he was likely to be investigated in the future by a vengeful incoming Trump administration and its DoJ since he had, after all, been involved in Hillary’s campaign against Trump- he probably hoped to quickly try to build some leverage to hold off the incoming Trump DoJ when Hillary’s campaign failed and the protection he had had thus far from the previous administration of Obama-Biden was in jeopardy.