| Wednesday 23 September 2230 BST - BBC Two Presented by Jeremy Paxman US President Barack Obama has delivered his first speech to the United Nations General Assembly in New York. Mr Obama named global challenges including nuclear proliferation, wars, climate change and the economic crisis. He said he was "well aware of expectations" in his presidency - but said that tackling global challenges could not be solely a US endeavour. Tonight we'll be outlining the big issues for the UN General Assembly and Obama. President Obama will chair a UN Security Council summit on nuclear non-proliferation and nuclear disarmament tomorrow, at which Prime Minister Gordon Brown is expected to announce that he wants to cut the UK Trident fleet of missile carrying submarines. Mark Urban will be considering the diplomatic impact and political significance of the move and how it fits into the UK's defence plan. And following Labour MP Stephen Hesford's resignation as a parliamentary aide over the Baroness Scotland affair, we'll debate if she really ought to now stand down, and ask if Gordon Brown understands the concerns of the public on this issue? In Bournemouth Nick Clegg has delivered his keynote speech to the Liberal Democrat conference. Our Political Editor Michael Crick has written that "Nick Clegg's talk today suggesting he's planning to become PM next spring is utterly bogus". We'll be hearing more from him tonight. Do join Jeremy at 10.30pm on BBC Two. You can follow Newsnight on Twitter and leave your comments about the programme on the Newsnight blog. | 
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