The Liberal Democrat leader Nick Clegg has admitted his party will face a tough fight in London at the next election, when Brent Central MP Sarah Teather stands down.
Last week the former education minister criticsed her own party and announced she was quitting in 2015. In an interview with ITV News, Nick Clegg said he knows the keeping the seat won't be easy. He spoke to Paul Brand.
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In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.