Sen.
Bernie Sanders is known as one of the least wealthy members of Congress.
Sanders earns a yearly salary of $174,000 as a senator and his total assets were less than $750,000 in 2015.
Financial-disclosure documents show he made more than $1 million in 2016 and 2017 from royalties from his books.
He published “Our Revolution” in 2016 and “Bernie Sanders Guide to Political Revolution” in 2017.