PARIS — Polish Foreign Minister Radosław Sikorski called on the U.S. Congress to weigh in on President Donald Trump’s growing threats to seize Greenland.

“The topic of territories, of war and peace, belongs to the U.S. Congress,” Sikorski said Wednesday, speaking alongside the foreign ministers of France, Germany and India. “I want to know what is the position of the U.S. Congress on Greenland.”

In recent days, some U.S. lawmakers have started pushing back against Trump’s calls to take over Greenland. On Monday, a bipartisan group of U.S. representatives released a statement saying annexing Greenland would be “dangerous” and could trigger a “civil war” among NATO members.

On Wednesday, Democrat Ted Lieu warned: “There is no legal justification, whatsoever, to use military force against a NATO ally like Greenland. If any military member participates in this without congressional authorization, they are following illegal orders.”

Sikorski was in Paris for the visit of Indian Foreign Minister Subrahmanyam Jaishankar, but the meeting with his European counterparts was also an opportunity to discuss Greenland.

French Foreign Minister Jean-Noël Barrot said the three European ministers discussed a joint European response to Trump’s threats, something that “was destined to be widened to all European partners.”

“What is at stake is the question of how Europe, the EU, can be strengthened to deter threats, attempts on its security and interests,” Barrot said.

“Greenland is not for sale, and it is not for taking. The age when you could buy and sell Louisiana is over, so the threats must stop,” he added, referring to France’s 1803 sale of the vast territory to the U.S. for $15 million.

In recent days, Trump has reiterated his claims to Greenland — a self-ruling Danish territory — following a separate U.S. operation to capture Venezuelan President Nicolás Maduro last weekend.

On Tuesday, eight of Europe’s top leaders insisted Greenland’s security must be ensured collectively by NATO and with full respect to the wishes of its people.

None of the three ministers in Paris said what options were being discussed.

Officials in Berlin however said discussions on how to safeguard Greenland’s sovereignty were ongoing on Wednesday following talks on the topic between European leaders and Denmark’s Prime Minister Mette Frederiksen in Paris on Tuesday.

Germany’s Foreign Minister Johann Wadephul is working on a plan with his counterparts that could include European deterrence in the event the U.S. tries to attack or seize Greenland, as well as increased NATO presence in Greenland’s direct vicinity, a German government spokesperson said.

Last year, when Trump started to seriously raise the issue of Greenland, Barrot didn’t rule out sending French troops to the island.