On Wednesday, the United States renewed its commercial attack against the European Union, with repeated threats to impose additional customs duties on European auto exports if the Europeans refuse to abandon their plans to impose taxes on digital giants and fail to sign a trade agreement between the two parties.

"Negotiating with the European Union is more difficult than negotiating with anyone else," US President Donald Trump said in an interview with Fox News on the sidelines of the Davos Forum. "They have benefited from our country for many years."

"If we don't reach something (a trade agreement), I will take measures, and it will be very high taxes on their cars and other products (exported) to our country," Trump added.

Trump, who met on Tuesday with European Commission President Ursula von der Laine in Davos to work towards negotiations on a bilateral "trade agreement", said that "it is very simple," explaining, "if we cannot reach a trade agreement (with the European Union), we will impose 25% tax on their cars. "

Trump, who in Washington faces a trial related to studying the possibility of his removal from power, held a quick and unprecedented press conference in Davos, in which he said he was "favored" if he could attend his trial sessions but his lawyers persuaded him not to do so.

On his part, US Treasury Secretary Stephen Mnuchin on Wednesday threatened from Davos to impose punitive duties on the Europeans, saying, "If they want to arbitrarily impose taxes on our digital companies, we will arbitrarily impose taxes on European car makers."

These threats show that the United States links the imposition of additional customs duties on Europeans or not to European warnings, particularly the French, with imposing taxes on digital giants and reaching a broader trade agreement with the European Union alike.

These new US statements come after the United States last week signed a partial trade agreement with China, which put an end to two years of trade war between the two economic powers.

"I want to wait until I finish China. I don't want to be preoccupied with China and Europe at the same time. Now we have finished with China," Trump said to CNBC.