Save Our Hospital campaigners will today deliver a petition to Downing Street, signed by 60-thousand people, against plans to downgrade hospitals in Ealing and Hammersmith & Fulham.
NHS North West London is proposing to close four out the nine A&E departments.
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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.