President Donald Trump has set a two-week deadline to decide if the United States will strike Iran after Iran reportedly fired fresh missile in Israel.

Press secretary Karoline Leavitt says the US president believes there is a "substantial chance of negotiations" with Iran "in the near future".

US President Donald Trump said Thursday he will decide whether to join Israel's strikes on Iran within the next two weeks as there is still a "substantial" chance of talks to end the conflict. His two-week deadline comes after a tense few days in which Trump publicly mulled joining Israel's strikes on Iran and said that Iran's supreme leader Ayatollah Ali Khamenei was an "easy target.