The public safety exception does not set a hard time when questioning must stop and the suspect must be taken into court, but it's generally understood to be about 48 hours.

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Acknowledging it could take 15 to 20 years to build, he accepts there must be some "stop-gap" solution, and says that ideas ruled out by the coalition - such as the building of extra runways at either Stansted or Gatwick - might need to be reconsidered.

BBC: Johnson: Government tip-toeing back to third runway

"Proceeding aggressively against wrongdoers is not only the right thing to do, but it also will serve to deter the sharp and unlawful practices of others who must be made to think twice -and stop in their tracks - rather than risk discovery, pursuit, and punishment by the SEC, " White told the panel.

WSJ: White promises "unrelenting" enforcement at SEC

"Proceeding aggressively against wrongdoers is not only the right thing to do, but it also will serve to deter the sharp and unlawful practices of others who must be made to think twice -and stop in their tracks - rather than risk discovery, pursuit, and punishment by the SEC, " White said in her testimony.

WSJ: White promises "unrelenting" enforcement at SEC