Hillary Clinton in The Associated Press

On Foreign Policy: End the Cuban embargo; that will shift onus to Castros

Clinton said she told Obama the embargo "wasn't achieving its goals" and "was holding back our broader agenda across Latin America."

"I thought we should shift the onus onto the Castros to explain why they remained undemocratic and abusive," Clinton writes. But President Obama ultimately decided to maintain the economic restrictions, she said.

In 2011, the White House said it would allow students seeking academic credit and churches making religious trips to visit the island. Additionally, the administration expanded the number of US airports permitted to offer charter service to the island.