U.S. presidential visits to Saudi Arabia in good and bad times

Donald Trump visits Saudi Arabia this week, 80 years after President Franklin D. Roosevelt laid the foundations of longstanding Saudi-U.S. relations based on an ironclad arrangement - the kingdom pumps oil, and the superpower provides security. Here is a timeline of U.S. presidential visits to Saudi Arabia, the world's biggest oil exporter and one of Washington's most important allies: Roosevelt - 1945, Richard Nixon - 1974, Jimmy Carter - 1978, George H.W. Bush - 1990 and 1992, Bill Clinton - 1994, George W. Bush - 2008, Barack Obama - 2009, 2014, 2015, and 2016, Donald Trump - 2017, Joe Biden - 2022 (Read more at AOL).