U.S. House members ask Trump to probe Navalny poisoning, suggest sanctions

"If the Russian government is once again determined to have used a chemical weapon against one of its own nationals, additional sanctions should be imposed," Representatives Eliot Engel, the Democratic committee chairman, and Michael McCaul, the panel's top Republican, said in a letter to Trump.

Germany, where Navalny is in a hospital, has said Navalny was poisoned with a Soviet-style Novichok nerve agent and wants the perpetrators held to account. Russia has until now not opened a criminal investigation and said there is no evidence yet of a crime. Navalny is the most popular and prominent opponent of President Vladimir Putin, and the German announcement that he was poisoned by a nerve agent has raised the possibility of further Western sanctions against Moscow.

The White House did not immediately respond to a request for comment on the letter. Trump said on Friday his administration had not yet seen proof that Navalny was poisoned.