With tensions high and Russia’s illegal war unfolding in Ukraine, a commitment to diplomacy — and peace — is urgently needed. That’s why I’m eager to see the United States return to the Iran nuclear deal that former President Donald Trump scrapped. I have been a peace activist since the nuclear freeze movement in the 1980s. There is no more critical task than to rejoin arms treaties and control nuclear proliferation. Trump’s “maximum pressure” campaign drove us to the brink of war and has only allowed Iran’s nuclear program to grow. Today, people in Iran continue to suffer under onerous sancti…