Trump this morning publicly asked China to investigate another conspiracy theory he made up about Biden's son, this time claiming he was essentially bribed $1.5 billion by China, again with zero evidence and a complete misstatement of well documented facts. Biden was an unpaid board member of an investment firm that had some Chinese members. Much later, in 2017, he purchased 10% of the just over $4.2 million fund for $420000. Trump's $1.5 billion figure, like the rest of his accusations, are pure fantasy without a scintilla of evidence to corroborate a word of it.
This was in response to the question of what he wanted from the Ukrainian president, his answer was specifically investigate Biden, not do more about corruption.