Diplomats can't agree on what Trump will do next in Syria

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President Donald Trump ordered the missile strike after watching television images of infants suffering from chemical weapons injuries. If Trump were to do otherwise, "It would be a very hostile act", Cardin said.

Pressed to clarify Sunday, National Security Adviser Lt. Gen. H.R. McMaster said the goals of fighting ISIS and ousting Assad were somewhat "simultaneous" and that the objective of the missile strikes were to send a "strong political message". But he said Trump now needed to work with Congress to set a future course.

A top Senate Democrat and Republican differed Sunday on Trump having used executive powers to attack the Syrian government but agreed that Congress must be included in further actions.

The Kremlin meanwhile said Russia's president, Vladimir Putin and Hassan Rouhani, his Iranian counterpart, agreed in a telephone call that that USA aggression against Syria was not permissible and violated worldwide law.

But the Senate Foreign Relations Committee's top Democrat, Sen. The OPCW in 2016 said that due to gaps and inconsistencies in Syria's declaration its compliance with the chemical weapons treaty could not be fully verified. And so what we're trying to do is obviously defeat the IS.

Still, Sen. Lindsey Graham, R-S.C., said he believed that Trump didn't need to consult with Congress. "I think the president has been quite clear", Tillerson told CBS' "Face the Nation." "Assad signed the chemical weapons treaty ban. There's an agreement with him not to use chemical weapons".

Mr Tillerson is expected in Moscow for talks with Russian officials next week.

The US fired 59 missiles at a Syrian airbase after the alleged attack.

Just last Thursday, Tillerson said that "steps are underway" to create an worldwide coalition with the goal of regime change.

The Syrian foreign minister denied the government's involvement in the Idlib incident, saying it had never nor would it ever use chemical weapons on either civilians or terrorists operating in the country.

"I don't think anything is off the table", Haley said.

Russian President Vladimir Putin and Iranian President Hassan Rouhani have spoken on the phone and agreed that recent USA airstrikes in Syria were unacceptable and violated worldwide law, the Kremlin said Sunday.

"We denounce the United States missile strike on Syria and regard it as a flagrant violation of an independent country's sovereignty (and) a measure that needs to be addressed and condemned in the UN Security Council", Rouhani said in a telephone conversation with Putin on Sunday.

She told the news channel that removing Assad was not the US' only focus and "there's multiple priorities".

But Trump's United Nations ambassador, Nikki Haley, seemed to strike a different tone.