Trump on Friday said he’s in talks with lawmakers on the Trans-Pacific Partnership trade deal, the biggest trade deal in US history.

Trump said he’ll announce a tariff of “one-tenth” of the current level on goods produced by US companies that are transported through China and Japan, a move that could be a boon to American manufacturers and farmers.

“The one-tentieth figure that’s been discussed is not going to be announced today,” Trump said during a news conference at the White House.

Trump has been a staunch supporter of the Trans Pacific Partnership, which would allow companies from Mexico and Asia to move their production and services across US shores.

The TPP was finalized in December and would create a $9 billion trade zone that would include Australia, Brunei, Canada, Chile, Japan, Malaysia, Mexico, New Zealand, Peru, Singapore, Vietnam, and the United States.

Trump told reporters that the United Kingdom, Germany, Japan and Australia are also considering the deal.