Additional US tariffs on Chinese imports are set to reach 104 percent on Wednesday, the White House told AFP, as Washington doubles down on planned action after Beijing vowed a "fight to the end" on levies.

US President Donald Trump had vowed a further 50 percent tariff on goods from China if Beijing did not retract upcoming retaliation -- and the White House confirmed that Trump will proceed with this action, taking the overall added duties this year to 104 percent.