'Was Trump watching?' CNN hosts spent an entire night questioning president's fitness for office

CNN hosts spent much of the afternoon and evening questioning President Donald Trump's mental stability after a series of tweets threatening to jail political opponents and launch nuclear weapons.

The president uncorked a series of tweets throughout the day, veering from topic to topic in response to Fox News reports, and CNN hosts worried about his cognitive functions, reported Axios.

"President Trump is kicking off 2018 by going on Twitter, blasting Democrats, calling for a political opponent to be thrown in jail, demanding a potential witness be investigated, and praising himself," host Jake Tapper said on his afternoon program. "So, no New Year's pivot, apparently."

Brian Stelter ripped the president's tweets as "madness," as an on-screen graphic questioned "Trump's fitness."

"What would we say if the leader of Germany or China or Brazil posted tweets like Trump's?" Stelter asked colleague Anderson Cooper. "How would we cover it? We'd say, 'That person is not well.' We'd wonder whether that person is fit to hold office."

Tapper worried whether the president had brought the world closer to nuclear war when he returned to CNN later Wednesday night, and he called Trump's tweets abnormal, unacceptable and unstable.

Although the president frequently complains about CNN and has threatened regulatory punishments against the network and its parent company, Trump frequently watches its programming.

"Was Trump watching?" Stelter asked, as he and his colleagues worried about the president's actions and fitness.