US should keep Iran nuclear deal: Bishop

Foreign Minister Julie Bishop has made the case to the US that the nuclear deal with Iran should remain.

Australia has urged the US to retain the nuclear deal with Iran in the absence of any credible alternatives.

US President Donald Trump will make an announcement this week on an "overall Iran strategy", including whether to decertify the international deal curbing Tehran's nuclear program, the White House says.

"We are urging that it be maintained and Iran's other behaviour be dealt with in different circumstances," Foreign Minister Julie Bishop told ABC TV.