Donald Trump on Thursday said China should open an investigation into former Vice President Joe Biden and his son - seeking the aid of a foreign power with whom he is locked in a trade war days after congratulating its leaders on 70 years of Communist rule.

He also answered the burning question he dodged three times the day before, confirming to DailyMail.com that he hoped his July phone call with Ukrainian President Volodymyr Selensky would result in 'a major investigation' of the Bidens.

The intention behind Trump's momentary mention of Biden and his son Hunter during the call has become a sticking point among congressional investigators and  journalists. 

An impatient, nail-spitting president refused to address the topic during a joint press conference Wednesday with the president of Finland, berating a reporter for repeating the question and trying his patience.

But on the White House South Lawn Thursday he said that if Ukraine 'were honest about it,' it 'would start a major investigation against the Bidens. It's a very simple answer.'