(Reuters) -An emerging U.S.-Japanese trade deal could unlock major investment, avert a potential shock to the global economy and may deliver political wins for both U.S. President Donald Trump and Japanese Prime Minister Shigeru Ishiba, though many specifics of the agreement remain unclear.

Japanese Prime Minister Shigeru Ishiba has vowed to remain in power to oversee the implementation of a new Japan-U.S. tariff agreement.

Japan’s chief trade negotiator Ryosei Akazawa has entered the White House to discuss tariffs with US President Donald Trump, public broadcaster NHK said citing government sources.

Shigeru Ishiba denied he had decided to quit after a source and media reports said he planned to announce his resignation to take responsibility for a bruising upper house election defeat.

The right-wing populist party Sanseito made big strides in parliamentary elections in Japan, capitalizing on concerns about the economy, immigration and overtourism.

As part of a trade deal reached this week, Japan agreed to invest $550 billion in projects across strategic U.S. industries, including energy, semiconductor manufacturing and shipbuilding. The White House said Trump would have final say over where the money goes and that the U.S. would keep 90% of profits on any investments.

With Ishiba fending off reports that he would be resigning in a month following poor election results, the Japanese agree to pour $550 billion

The reports come after Trump announced a trade deal with Japan, and days after Ishiba’s governing coalition lost its majority in the country’s upper house.