WASHINGTON (AFP) — The United States was poised Thursday to announce a historic trade deal with China, days before new tariffs are due to kick in between the world’s two largest economies, easing a commercial dispute that has roiled markets for almost two years.

Reports that Washington and Beijing had struck a bargain at last — subject to approval by US President Donald Trump — sent US stocks sailing to their first record closes of December.

“Getting VERY close to a BIG DEAL with China. They want it, and so do we!” Trump tweeted in a markedly optimistic tone, although it was unclear if he would officially confirm the agreement on Thursday.

Trump’s flagging of an imminent breakthrough comes ahead of new tariffs planned to take effect Sunday and also just as he is almost sure to become only the third US president to be impeached.

With his 2020 re-election battle heating up Trump is keen to seize the political initiative and show voters his punishing struggle with China has brought results.

The US ultimately wants China to open its vast economy to more goods and to conduct sweeping reforms of what Washington has long called systemic abuse against foreign investors.

Recently, though, White House officials have indicated they would settle for less in a so-called “phase one” deal.

The Washington Post reported that Trump had signed off on a swap of tariff reductions in return for China spending $50 billion on US farm goods, tightening its intellectual property protections and opening its financial services markets.

The paper cited Michael Pillsbury, a China expert at the Washington-based Hudson Institute it said had been briefed by Trump, and an unnamed senior administration official.

The paper reported that plans for an official announcement had not been nailed down, adding that the administration does not intend to seek congressional approval.

China’s commerce ministry said Thursday the two sides were in “close” contact ahead of Sunday’s deadline.

In addition to existing tariffs, Trump had threatened to impose a 15 percent levy Sunday on around $160 billion of Chinese exports, including popular US consumer goods like electronics and clothing.

China had previously said it would respond with a 25 percent tariff on US autos and a five percent tariff on auto parts — levies that were suspended earlier this year as a goodwill gesture.

According to The Wall Street Journal, the US side is offering to scrap the threatened Sunday tariffs and also cut existing duties imposed on about $360 billion in Chinese goods.

Trump’s overall goal with China, a keystone of his presidency, is to uproot what Washington says are Beijing’s predatory trade practices, including forced technology transfers and massive intellectual property theft.

Trump himself has blown hot and cold, repeatedly insisting that China needs a deal more than the United States does.