Sen. Ben Cardin Benjamin (Ben) Louis CardinCongress must finish work on popular conservation bill before time runs out PPP application window closes after coronavirus talks deadlock Congress eyes tighter restrictions on next round of small business help MORE (D-Md.) on Monday said that it’s “difficult to understand” 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 treatment of America’s allies.

“The manner in which he has treated our closest allies is really difficult to understand,” Cardin said on CNN’s “New Day.”

“These are democratic countries that share our values and yet the president seems to want to go alone when it comes to working with our closest allies.”

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The remarks come after Trump over the weekend said he would not sign a communique with the members of the Group of Seven (G-7). The president cited alleged “false statements” made by Canadian Prime Minister Justin Trudeau.

“Based on Justin’s false statements at his news conference, and the fact that Canada is charging massive Tariffs to our U.S. farmers, workers and companies, I have instructed our U.S. Reps not to endorse the Communique as we look at Tariffs on automobiles flooding the U.S. Market!” the president tweeted Saturday.

Prior to Trump’s tweet, Trudeau had said all G-7 members signed the joint statement following the summit in Canada.

The summit took place after the Trump administration said it would impose steel and aluminum tariffs on Mexico, Canada and the European Union after previously providing those allies with brief exemptions.

On Sunday, Trump doubled down on his criticisms of the European Union and Canada, tweeting "Fair Trade is now to be called Fool Trade if it is not Reciprocal.”

Cardin, who sits on the Senate Foreign Relations Committee, said Trump is the “outsider” in the G-7, a coalition that includes the United States, France, Japan, Italy, Canada, Germany and the United Kingdom.

“Diplomacy means bringing people together,” Cardin told CNN.

“But we start from strength and that is working with our closest allies. We don’t pull them apart. And President Trump, throughout his presidency, he started with criticizing our closest allies when he became president,” he added.