The French government said it will summon U.S. Ambassador Charles Kushner to the Foreign Affairs Ministry on Monday after the Trump administration publicly linked left-wing militants to the fatal beating of conservative activist Quentin Deranque in Lyon.

French Foreign Affairs Minister Jean-Noel Barrot announced the decision following a statement from the U.S. State Department’s Counterterrorism Bureau asserting that reports, “corroborated by the French Minister of the Interior,” indicated Deranque was killed by left-wing militants. The bureau added that “violent radical leftism is on the rise” and said those responsible should be brought to justice.

Deranque died last week from brain injuries sustained during an attack on the sidelines of a student meeting in Lyon, where far-left lawmaker Rima Hassan was scheduled as a keynote speaker. French authorities have handed preliminary charges to seven individuals. Prosecutors in Lyon requested charges of intentional homicide, aggravated violence, and criminal conspiracy for the group. Six suspects were charged on all three counts, while a seventh faces complicity charges tied to the same offenses.

The killing has intensified political tensions in France ahead of next year’s presidential election. President Emmanuel Macron called for calm over the weekend after roughly 3,000 people gathered in Lyon for a march organized by right-leaning groups honoring Deranque.

Barrot rejected what he described as attempts to politicize the tragedy. “We reject any instrumentalization of this tragedy, which has plunged a French family into mourning, for political ends,” he said, adding that France does not require “lessons” from what he termed the “international reactionary movement” on issues of violence.

In addition to the protest over Washington’s statement, Barrot said he intends to raise U.S. sanctions imposed on former European Union commissioner Thierry Breton and on Nicolas Guillou, a French judge serving at the International Criminal Court. The French government has called those sanctions “unjustified and unjustifiable.”

Kushner was requested to appear at the ministry on Monday. He was previously summoned last August over a letter to Macron alleging France had not done enough to combat antisemitism, though a representative attended in his place at that time.