DONALD Trump has said there is "no proof yet" that Russia poisoned opposition leader Alexei Navalny with the nerve agent Novichok.
On Friday, the president said he would "look into" claims Navalny was left - and said he won't be happy if they're true.
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"It's tragic. It's terrible, it shouldn't happen," Trump told reporters. "We haven't had any proof yet, but I will take a look."
Trump added that his administration will "have to look at it very seriously" before he shifted the focus of the press briefing to .
The president said that he would be very unhappy if did poison Navalny, 44, a prominent critic.
In the lead up to his poisoning, Navalny had called Putin's United Russia group "a party of crooks and thieves."
On an flight to on August 20, Navalny suddenly became violently sick.
His supporters claim he was poisoned at an airport in before the flight.
Navalny was taking the S7 airlines flight from Tomsk Bogashevo airport after he was seen drinking tea in the airport cafe.
German officials said toxicology tests of blood samples from Navalny conducted at a military lab produced "unequivocal evidence" he was poisoned with Novichok.
Translated as "newcomer" in Russian, Novichok refers to the advanced nerve agents developed by the Soviet Union in the seventies and eighties.
The nerve agent was also used to poison MI6 in Salisbury on March 3, 2018, as well as hero cop Sgt Nick Bailey.
Navalny has been in an induced coma for over a week after he was airlifted from Russia to , where he is being treated in .
Russian doctors had initially blocked the 44-year-old's exit, claiming their decision was before to Putin.
Prime Minister and secretary-general Jens Stoltenberg also of Putin's government.
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The US Deputy Secretary of State Stephen Biegun told Russian Ambassador Anatoly Antonov the Kremlin had violated the Chemical Weapons Convention by using Novichok during a tense meeting, reports said.
Russia denied it was involved but has yet to open a criminal investigation.
Despite reports that Navalny had his tea spiked, Russian scientist Vladimir Uglev, who claims he invented the radioactive material, said the assassins likely smeared it on his underwear or socks.