 But Trump did not announce his pick, instead saying that he was officially challenging President Biden to another debate, this time without moderators. Meanwhile, in Washington, NATO allies are offering Ukraine more help to bolster its air defenses. The U.S., Germany and Romania will each send Ukraine a Patriot missile system, while a fourth will be assembled using parts from the Netherlands and others. Italy will send a ground-based air defense system. President Biden promised to prioritize Ukrainian aid.