But I certainly think preserving the maximum flexibility in surveillance of transactions and communications is going to continue to be a critical element if we're going to prevent these attacks.

NPR: U.S. Clarifies Security Rules for Air Travel

So I think that gives every leader a great deal of flexibility in deciding who should participate.

WHITEHOUSE: Press Briefing

You are more productive when people are all together, but I think you need to have a little bit of flexibility.

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