calling into question

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Noun1.calling into question - a challenge to defend what someone has said
challenge - a call to engage in a contest or fight
References in periodicals archive ?
The company served papers on the Rail, Maritime and Transport union calling into question the validity of a ballot, even though peace talks were being held in a bid to resolve a row over jobs.
Some aquatic bacteria that orient themselves using Earth's magnetic field swim in the opposite direction from what researchers typically expect, calling into question a longstanding theory of what this navigational behavior accomplishes.
Site and work inevitably enter into a state of symbiosis, or else of conflict, calling into question the white cube and traditional hierarchies of use.