WASHINGTON, July 16. /TASS/. US President Donald Trump and Secretary of State Michael Pompeo are looking into all possible variants of sanctioning Turkey for its deal to purchase S-400 surface-to-air missile systems from Russia, US Department of State Spokesperson Morgan Ortagus has told reporters.

During the regular press briefing on Tuesday, Ortagus said the president and the secretary of state "are examining all of the options that are in the CAATSA [Countering America's Adversaries Through Sanctions Act] legislation."

She said the US authorities have been "pretty clear <…> what the ramifications could be."

"As it relates to which sanctions options will be chosen, we don’t preview those sanctions in advance," the spokesperson added.

When asked to clarify possible measures, Ortagus advised to use internet search engines and see "the 12 options that are available" under CAATSA.

"As soon as we have an announcement to make, I’ll let you know," she added.

On August 2, 2017, US President Donald Trump signed The Countering America's Adversaries Through Sanctions Act (CAATSA), which paves the way for tougher sanctions against Russia, Iran and North Korea.