US Secretary of State Mike Pompeo is scheduled to appear on Friday before a committee of Congress probing whether the Trump administration had adequate justification for the assassination of top Iranian commander Qassem Soleimani in Iraq earlier this year. Pompeo's appearance, which is scheduled for 8:30am (13:30GMT) and will be limited to two hours, will be the first time the top US diplomat has faced questions publicly from legislators about the Soleimani assassination. Pompeo is expected to make the case that Soleimani's killing was justified and that the Trump administration's policy of applying "maximum pressure" on Iran is working.