But here is the thing: It is also entirely possible that the Bidens’ actions, whether or not provably illegal, were so objectively suspicious, so suggestive of corruption, that it was perfectly reasonable for Trump to believe that they should be investigated — and that they could have violated American law, as well as Ukrainian law.
The president’s defense has not been given a fair opportunity to prove that. Even though the House impeachment managers are now arguing about Biden corruption allegations in their Senate presentation, the two leaders of the House impeachment inquiry, Adam Schiff and Jerry Nadler, took the position that Republican claims about the Bidens were irrelevant — a partisan red herring to distract from the “real” issues. They steadfastly refused to permit witnesses on that topic (including the Bidens themselves).
Moreover, the president was denied the right to have his counsel participate in the main investigative phase, run by Schiff. So, even though Schiff began the House hearings with an absurd parody version of the Trump–Zelensky conversation, falsely suggesting that Trump had asked Zelensky to “make up dirt” about Biden, the House denied the president the opportunity to prove that he was actually asking for help investigating activity that, objectively, appears quite suspicious and potentially corrupt.