US Treasury Secretary Steven Mnuchin said that President Donald Trump is ready to meet his Iranian counterpart Hassan Rouhani without preconditions while maintaining maximum pressure on Tehran. The statement came just days after Iran said it has fired up centrifuges to boost its enriched uranium stockpiles.<br />''<span style="color: #222222;"><br />''Tensions have been escalating between Iran and the United States since May last year when Trump pulled out of the 2015 nuclear accord with Tehran and began reimposing sanctions that have crippled the Iranian economy</span><span style="font-weight: bold;">.</span><br />