Which preposition to use with tergiversation

in Occurrences 2%

When Elisha Boone denounced the outbreak of John Brown at Harper's Ferry as more criminal than Aaron Burr's treason, his children made his prepossessions their own; when, three years later, the father proudly eulogized the uprising he had so luridly condemned, his children saw no tergiversation in the swift conversion.

of Occurrences 1%

The patience of even such heroic souls as Lydia Becker and Caroline Biggs was almost exhausted with the tergiversations of Members of the House of Commons.

on Occurrences 1%

Horace was an upright young fellow, incapable of tergiversation on a matter of honor, going to the point without waste of words, and as ready to pledge his cloak for a friend as to give him his time and his night hours.

Which preposition to use with  tergiversation