ABC World News Tonight With David Muir
>> reporter: all this, as troubling new reports emerge. "the miami herald" publishing photos from a pool contractor, showing exposed rebar in the crumbling concrete at the champlain towers south, just 36 hours before the catastrophic chance. that contractor telling the paper he was struck by the lack of maintenance in the lower level. and abc news confirming a letter was sent to residents in april, warning that the damage had gotten significantly worse, that "concrete deterioration is accelerating" and "would begin to multiply exponentially," after a 2018 engineering report revealed the need f...