WASHINGTON—President Trump said he would sign the phase-one trade deal with China on Jan. 15 and will later travel to Beijing for talks on a broader pact.

The president, in a Tuesday morning tweet, said he would be joined at the White House signing by “high level” Chinese officials, but he did not specify who would attend. Mr. Trump also pledged to travel to Beijing to begin negotiations on the second phase of the trade deal “at a later date.”

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