(CNN) The top Democrat and Republican on the House Foreign Affairs Committee on Monday called on President Donald Trump to impose congressionally mandated sanctions on Russia for its poisoning of an ex-spy in the United Kingdom in March 2018.

The Chemical and Biological Weapons Control and Warfare Elimination Act of 1991 "mandated the second round of sanctions to be imposed within three months, yet well over a year has passed since the attack. Therefore, we urge you to take immediate action to hold Russia fully accountable for its blatant use of a chemical weapon in Europe," Reps. Eliot Engel, a New York Democrat, and Michael McCaul, a Texas Republican, wrote. The two said that a failure to do so "is unacceptable and would necessitate that Congress take corrective action."

In addition to calling for the imposition of the sanctions, Engel and McCaul also urged Trump to act in concert with our allies and partners to maximize our collective impact."

The White House did not immediately reply to a request for comment.

In August 2018, the United States imposed a first round of sanctions on certain technology under the CBW Act in response to the poisoning of Sergei Skripal and his daughter, Yulia. It also expelled 60 Russian diplomats and closed a Russian consulate in response.

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