Bidens has earned more than $ 15 million since 2016

According to the financial information and tax returns provided by the campaign, former Vice President Joe Biden and his wife, Dr. Jill Biden, have earned more than $ 15 million since 2016.

The bulk of the revenue comes from bookstores and conferences, with the Bidens earning around $ 9.5 million in 2017, a year after Biden left. That year, the Bidens donated more than a million dollars to charity, according to the documents.

Since leaving the office, both Bidens have served as university professors. Jill Biden taught at Northern Virginia Community College and earned more than $ 180,000 in two years. Former Vice President Joe Biden has been appointed Presidential Professor Benjamin Franklin of the University of Pennsylvania, earning more than $ 775,000 in two years.

This is a story in development and will be updated.