The United States has announced new sanctions against Iran following a stream of threats and warnings over a recent missile test.
In a statement on its website on Friday, the US Treasury added 13 Iranian individuals and 12 entities to its sanctions list for their role in Iran's ballistic missile programme.
"Iran's continued support for terrorism and development of its ballistic missile program poses a threat to the region, to our partners worldwide, and to the United States," said John Smith, acting director of the Treasury's Office of Foreign Assets Control.
Al Jazeera's Kimberly Halkett, reporting from Washington DC, said the sanctions were supported by the Senators as well as Congress members.
"They support the strong stance. The Senators sent a letter to the White House saying that they wanted to see these new sanctions and that's what we are seeing," she said.
Hours earlier, US President Donald Trump said Iran was "playing with fire" after Tehran dismissed his warnings over its latest missile test as unfounded and provocative.
In another early morning post on Twitter, Trump said his administration would not be as "kind" to Iran as the government of his predecessor, Barack Obama.
"Iran is playing with fire - they don't appreciate how 'kind' President Obama was to them. Not me!"