The pressure was caused by bleeding from his recent falls, the center said. Carter, 95, will undergo the procedure Tuesday morning.
OPEC and its allies look set to extend oil supply cuts this week at least until the end of 2019 as Iran joined top producers Saudi Arabia.
Russian Acting Deputy Foreign Minister said it was possible to discuss the future of the Iran nuclear deal without the participation of the United States.
As the US military opens a new front in its air war in Afghanistan, experts are warning of the risk of alienating the local population.
A U.S. Navy transport plane carrying 11 people crashed in the Philippines Sea south of Japan as it flew to the aircraft carrier the USS Ronald Reagan.
Iran promised on Monday to give a "crushing" response if the United States designated its elite Revolutionary Guards as a terrorist group.
U.S. President Donald Trump warned on Tuesday that the United States will be forced to "totally destroy" North Korea unless Pyongyang backs down from its nuclear standoff.
China on Wednesday denied violations of religious freedom
Some 300 Japanese and US military personnel on Wednesday carried out live-fire artillery training in northern Japan
Iran could abandon its nuclear deal with world powers "within hours", if the United States continues to impose new sanctions
The Russian Embassy in Tehran said on Monday Russian Deputy Minister of Foreign Affairs Sergei Ryabkov will hold talks with his Iranian counterpart Abbas Araghchi .