Former Vice President Biden said in an interview on Tuesday that European leaders are sharing their concerns about President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE's hostile rhetoric toward them.

“The things that are the most debilitating from the perspective of most of the Europeans is the way he conducts himself when he is with allies,” Biden told The Washington Post. “Several of them have said to me the degree of disrespect shown is debilitating."

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“Several of them have spoken to me about what was referred to as his gratuitous criticism of [German Chancellor Angela] Merkel, who is in a tough spot already,” he continued. “They’ve never seen anything like that before.”

Biden made the comments at the at the Copenhagen Democracy Summit, which was attended by various western leaders, including Danish Prime Minister Lars Loekke Rasmussen and former British Prime Minister Tony Blair.

The former vice president's comments come as trade relations between the U.S. and many of its western allies have hit a rough patch.

Merkel slammed Trump's tariffs on steel and aluminum earlier this month after the Group of Seven (G-7) summit, saying Germany would implement retaliatory measures.

“We won’t allow ourselves be ripped off again and again. We will act too,” Merkel said. “We will try to see if we can stop this from happening ... And then hopefully the EU will respond again in the same unified way.”

British Prime Minister Theresa May also blasted Trump's tariffs, calling them "unjustified."

"I am deeply disappointed at the unjustified decision by the U.S. to apply tariffs to E.U. steel and aluminum imports," May said.

"The U.S., E.U. and U.K. are close allies and have always promoted values of open and fair trade across the world," she said. "Our steel and aluminium industries are hugely important to the U.K., but they also contribute to U.S. industry including in defence projects which bolster U.S. national security."