The US president posted his latest tweet ahead of European Commission President Jean-Claude Junker’s arrival in Washington for trade talks.
“The European Union is coming to Washington tomorrow to negotiate a deal on Trade,” Mr Trump said. “I have an idea for them. Both the US and the EU drop all Tariffs, Barriers and Subsidies! That would finally be called Free Market and Fair Trade! Hope they do it, we are ready – but they won’t!”
The president’s tweet came after his administration said it would pay $12bn (£9.1bn) in aid to US farmers who have been hit by retaliatory tariffs imposed by China and the EU.
The money will help soyabean, pork and other farmers, while the administration thrashes out new arrangements with trading partners.
Sonny Perdue, the US agriculture secretary, said: “President Trump has promised since day one that he has the back of every American farmer and rancher.
“This is a short-term solution that will give President Trump time to work on the long-term trade policy and deal that will benefit agriculture as well as all sectors of the American economy.”
In a tweet earlier in the day, the president said: “Tariffs are the greatest.”
He told an event in Kansas City on Tuesday that “farmers will be the biggest beneficiary” of trade talks.
“Just be a little patient,” Mr Trump said.