Prime Minister Shinzo Abe said Friday that Japan won't make any easy concessions just to advance the Trans-Pacific Partnership free trade talks before he meets with U.S. President Barack Obama on April 28.

The TPP negotiations are "in the final phase, but problems remain," Abe said during a session of the Upper House Budget Committee. "It is impossible to make unnecessary concessions in line with my trip to the United States."

Abe is setting out April 26 for an eight-day official visit to the U.S.