ramping up pressure on israel to define the next phase of the war with hamas. this as the idf claims it s discovered the biggest hamas tunnel in gaza and describing it as an underground terror city. hong kong pro-democracy media tycoon jimmy lai i on trial at this hour, facing his most consequential legal challenge to date. live from atlanta, this is cnn newsroom with michael holmes. hours from now, the u.s. defense secretary will arrive in israel, his second trip to the country since the october 7 attack by hamas. and u.s. officials said lloyd austin will meet with israeli officials for updates on the war, but he s also expected to press them to define specific operational milestones and work to drill down on efforts to boost humanitarian aid to gaza. his visit comes as the israel defense forces says it s uncovered the biggest hamas tunnel in gaza, wide enough to drive a large vehicle through. that tunnel, which the idf says was secured a few weeks ago, was made publ