By Steve Holland WASHINGTON (Reuters) – The United States is pushing OPEC+ nations not to proceed with potential deep oil output cuts, a source familiar with the matter told Reuters, as President Joe Biden seeks to prevent U.S. gasoline prices from rising. Washington is arguing to OPEC+ nations that economic fundamentals do not support an output cut, the source said. OPEC+, which includes Saudi Arabia and Russia, is working on cuts in excess of 1 million barrels per day, sources told Reuters this week. The cuts could spur a recovery in oil prices. The White House declined to comment. “We are n…