Sen. Marco Rubio said he is "concerned" by a Trump administration official's assertion that there is "no change" in USA policy on Syria despite the American airstrike against a Syrian government air base.
Images of civilians suffering the apparent effects of a gas attack, including convulsions, vomiting and foaming at the mouth, provoked global outrage and prompted US President Donald Trump to order a strike on a Syrian airbase.
U.S. Secretary of State Rex Tillerson said that Russian Federation failed to live up to its agreement in a chemical weapons accord.
Bashar Assad also thanked the Iranian leadership and the people for their continued support of the Syrian people in the face of the terrorist war which is backed by many Western and regional states.
"We are asking Russian Federation to fulfill its commitment and we're asking and calling on Bashar al-Assad to cease the use of these weapons".
Rubio has long argued that Assad needs to be removed from power in Syria.
The CBS host pressed Tillerson on saying there's been no change in policy regarding Assad, wondering if he was stating that the Syrian president's fate should be determined by the Syrian people.
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On Saturday, two Syrian opposition-held towns, including the one where 87 people died in the chemical weapons attack, were hit by deadly airstrikes.
"Part of the discussions when I visit Moscow next week is to call upon Foreign Minister Lavrov and the Russian government to fulfill the obligation it made to the global community when it agreed to be the guarantor of the elimination of the chemical weapons; and why Russia has not been able to achieve that is unclear to me".
Days later, after a chemical weapons attack on Syrian civilians that the USA blames on Assad's regime, the Trump administration sharpened its rhetoric and launched several dozen cruise missiles at a Syrian airfield, marking the first US military effort against the Assad government.
Moscow has said it doesn't believe Assad's forces carried out the attack on Thursday that involved children and called for a "thorough and impartial" investigation.
Tillerson is heading to Lucca, Italy, for a two-day meeting of G7 foreign ministers that starts Monday, and he will continue from there to Moscow for meetings with Sergey Lavrov, his Russian counterpart, and other Russian officials.