The Trump administration has stepped up its communications with China over trade, the White House's top economic adviser said on Wednesday, as people familiar with the effort said an invitation for a new round of trade talks was sent to Beijing.

The invitation from senior U.S. officials led by Treasury Secretary Steven Mnuchin was sent to Chinese counterparts, including Vice Premier Liu He, these sources said.

The outreach comes as the Trump administration prepares to activate tariffs on $200 billion worth of Chinese goods, hitting a broad array of internet technology products and consumer goods from handbags to bicycles to furniture.