Critics raised concerns over the use of a commercially available app, signal, for such sensitive discussions. Report behind closed doors, the president reportedly was angry waltz had the phone. Trump defends use of signal app amid chat controversy trump addressed concerns over the use of the signal app in a recent interview, downplaying the issue and saying, there was no classified. President trump said his national security adviser, mike waltz, learned a lesson after he opened up a secret chat of trump officials to a reporter. President donald trump defended national security advisor michael waltz during an ambassador meeting on monday, as his administration faces fierce backlash over the recent signal text chain leak.
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