Trump is quoting Congressman McClintock.
McClintock is also the same person who was asking Whitaker about the way FBI handled the Roger Stone arrest.
Whitaker's response to McClintock was basically:
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The agents has to consider several factors to ensure the safety of those being arrested and of themselves.
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The FBI is prepared to give a report in a closed session to Congress, explaining all the factors they considered when they concluded that the 29 combat-ready agents arrested Stone.