China warns that 'meddling' in Hong Kong could jeopardize Phase One deal

WSJ report
From the report:
Beijing has begun quietly delivering a message to Washington: U.S. pressure over matters China considers off limits could jeopardize Chinese purchases of farm goods and other U.S. exports under the "Phase One" trade deal.
This doesn't sound like they're on the brink of any action but it's not a good sign for relations.