Iran pushes back after Trump says Tehran can either negotiate 'a fair and equitable deal' or face a US 'armada'.

U.S. President Donald Trump warned Iran on Wednesday it should "make a deal" with the U.S. on its nuclear program or face a large-scale U.S. military attack.

Fears of US attack rise as president says Tehran can either negotiate 'a fair and equitable deal' or face a US armada.