"As you know, they've announced a few days ago that they are going to move a lot of their manufacturing business to Mexico," Trump said at an event held in western Pennsylvania.
"I am just notifying John Deere right now that if you do that, we are putting a 200 per cent tariff on everything that you want to sell into the United States."
Earlier this year, John Deere announced that it was laying off hundreds of employees in the American Midwest and increasing its production capacity in Mexico, a decision that upset workers and some political leaders.
John Deere announced plans to increase its production in Mexico. (AP PHOTO)
Trump has frequently said he would slap automakers that move their production to Mexico with a 200 per cent tariff, but this appears to be the first time he has extended that threat to an agricultural equipment manufacturer.
A representative for the company did not respond to a request for comment about Trump's tariff threats.
Speaking to a gathering of farmers in a rural area outside of Pittsburgh, Trump also said he would press Chinese President Xi Jinping to honour a deal to purchase $US50 billion of US agricultural goods.
During the so-called "Phase 1" trade deal inked between China and the United States during Trump's 2017 to 2021 term, the United States agreed to cut some tariffs on Chinese goods in exchange for pledges to purchase more American agricultural products, energy and manufactured goods. At the time, Trump said China would buy $US50 billion in US agricultural products, though Chinese purchases fell well short of that figure.
"Probably my first call - I'm going to call President Xi - I'm going to say you have to honour the deal you made. We made the deal, you buy $US50 billion worth of American farm products, and I guarantee you, he will buy it, 100 per cent he will buy it," Trump said.
Farmers and industrial workers are a crucial part of Trump's coalition, and turning out these constituencies will be important if he is to beat Vice President Kamala Harris, the Democratic nominee, in the US election. That is especially true in Pennsylvania, where polls consistently show a razor-thin race.
Vice President Kamala Harris is due to campaign in the state of Pennsylvania later this week. (AP PHOTO)
Harris is also visiting Pennsylvania on Wednesday.
Trump leads among likely voters in the battleground states of Arizona, Georgia and North Carolina, outpacing Harris six weeks before the November 5 presidential election, a New York Times/Siena College poll suggested.
Trump bested his Democratic rival 50 per cent to 45 per cent in Arizona last week, 49 per cent to 45 per cent in Georgia and 49 per cent to 47 per cent in North Carolina, according to the poll, which echoed other recent polls showing a close contest.
The three states are among seven critical swing states that are likely to decide the 2024 presidential contest between Trump and Harris.
Monday's poll includes a margin of error of plus or minus 4.4 percentage points in Arizona among 713 people polled in Arizona; plus or minus 4.6 points among 682 surveyed in Georgia and plus or minus 4.2 points among 682 surveyed in North Carolina.
with AP
