Obama get $500,000 children's book deal just before taking office
Analysts say there don't appear to be any rules that would bar such transactions after a president takes office, but it's unclear whether an incoming or sitting president has ever signed a book deal upon entering the White House.
"I don't recall any sitting president entering into a book deal," said campaign finance lawyer Jan Baran, former general counsel to the Republican National Committee. "They all have historically done that after they leave office.
The half a million comes on top of millions that he's received in royalties from both of his current books.