Assuming that the car was driven by a non-Jew it would only be a shevut. The room for a heter is then greater. If the Secret Service personnel are the majority then the question whether the car is being driven for them or the Kushners (even if the Kushners would walk the security detail would have to accompany them ). If for the security people then it is oovin d’chol or ziluta d’Shabbat (Rav Moshe says this about riding a bus where the Jew does not have to pay) which might even be easier to be waived.
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