A dozen senators are making a bipartisan appeal to President Joe Biden to reinvigorate the power of U.S. authorities to seize Iranian oil assets under an enforcement program they say has been allowed to languish. Despite existing sanctions, Iranian oil exports jumped 35% last year and proceeds are being used to sponsor attacks on U.S. citizens and service members as well as allies, the senators said in a letter to the president. Brinkmanship at sea was on display Thursday when masked Iranian navy commandos seized a U.S.-bound oil tanker in the Gulf of Oman, one of several vessels it has taken as bargaining chips in negotiations with the West.