US President Donald Trump will decide whether or not the US gets directly involved in the Iran-Israel conflict within the next two weeks, the White House has said.

In a White House press briefing, Press secretary Karoline Leavitt delivered a message directly from Trump:

"Based on the fact that there's a substantial chance of negotiations that may or may not take place with Iran in the near future, I will make my decision whether or not to go within the next two weeks."

Earlier, Iran's deputy foreign minister told the BBC it would cause "hell" in the region if the US got involved, adding: "This is not America's war."

The news comes 24 hours after Trump said he had not made up his mind on joining the conflict.