US is in violation of the USMCA. It's the trade agreement that Trump negotiated and signed which prohibits tariffs. Why would anyone trust him to honor any agreement he makes?

"All products that have zero tariffs under NAFTA will remain at zero under USMCA."

Source:
https://www.trade.gov/usmca-dayone-0?anchor=content-node-t7-field-lp-region-2-1