center. of course, one person who is noticeably absent from this scene you are seeing before us, president biden they're talking to nancy pelosi, the speaker, absent is former president donald trump. there are reports he may make a visit this afternoon by himself to ground zero but he is not part of this formal commemoration. he of course has been very critical of the withdrawal from afghanistan though it was his deal with the taliban which preceded the withdrawal, he said it should have been done differently, but it was too hasty, too difficult. but innocenti symbolises that political polarisation and this moment in america. there is former president 0bama there, speaking to the senate majority leader chuck schumer. so even at this moment of unity, the absence of president trump is a reminder of those divisions. so what