Why we're unlikely to get a smoking gun in Trump-Ukraine saga

There are two possible scandals in the Trump-Ukraine-Biden phone call saga, but we’re unlikely to get evidence of a smoking gun on either of them.

These scandals being; first and foremost, whether Trump withheld nearly $400 million in military aid in order to pressure Ukrainian President Volodymyr Zelensky into investigating the business dealings of Joe Biden’s son, Hunter Biden. (There is a strong and I’d add reasonable presumption that such an investigation might damage Joe Biden’s 2020 presidential bid.) The second possible scandal is whether as vice president, Joe Biden illegitimately pressured Ukraine to fire its top prosecutor in order to prevent him from pursuing evidence of wrongdoing by Hunter Biden.