"We know firsthand that the additional tariffs will have a significant, negative and long-term impact on American businesses, farmers, families and the US economy," read the letter. "Tariffs are taxes paid directly by US companies."
The letter came as the US Trade Representative Office plans to begin a public hearing on June 17 to solicit public comments on and responses to proposed tariff measures.
The Trump administration increased additional tariffs on $200 billion worth of Chinese imports from 10 per cent to 25 per cent in May, and has threatened to impose tariffs of 25 per cent on essentially all remaining Chinese goods sold to the US -- valued at roughly $300 billion -- which are not yet subject to extra duties.
In response, China raised additional tariffs on a range of US imports on June 1.
Tariffs Hurt the Heartland said combined with the impact of previously implemented tariffs and retaliation, the new tariffs on another $00 billion worth of Chinese imports, if imposed, would result in the loss of more than 2 million US jobs, add more than $2,000 in costs for an average American family of four, and reduce the value of American GDP by 1 per cent.
"We urge your administration to get back to the negotiating table," signatories of the letter told Trump.
"An escalated trade war is not in the country's best interest, and both sides will lose."