President Donald Trump suggested challenging licenses for NBC and other broadcast news networks on Wednesday, a salvo that followed reports his own secretary of state had called him a "moron" after a discussion of the U.S. nuclear arsenal.

"With all of the Fake News coming out of NBC and the Networks, at what point is it appropriate to challenge their License? Bad for country!" Trump, a Republican, wrote in a post on Twitter.

Trump and his supporters have repeatedly used the term "fake news" to cast doubt on critical media reports about his administration, often without providing any evidence to support their case that the reports were untrue.