This is stated in a letter to the President from the leadership of the Senate foreign relations committee.
Republican Jim Risch and Democrat Bob Menendez, the heads of the Senate foreign relations Committee, sent a letter to President Donald Trump asking that the White House consider imposing sanctions on Russia over the chemical weapons poisoning of Alexey Navalny.
“We are very concerned about reports that Russian anti-corruption activist Alexey Navalny was poisoned in August 2020 with a Novichok – type nerve agent,” the letter signed by the senators said, – In accordance with section 306 (b) of the chemical and biological weapons control and elimination Act of 1991, we request you to consider whether the Russian Federation has used chemical or biological weapons, in violation of international law, against one of its citizens and, therefore, whether [Russia] should be subject to the sanctions provided for in the law.”
“The poisoning of Navalny is particularly alarming since Novichok was also used in the attempted murder of Sergei Skripal in March 2018 in Salisbury… In that case, your administration concluded that the Russian government was behind the attack and, consequently, sanctions were imposed on it. The United States must once again make it clear that any behavior of this kind is unacceptable,” said Jim Risch and Bob Menendez.