A Kentucky Democrat lawmaker has become the latest person to openly question President Donald Trump’s mental state.

John Yarmuth suggested the billionaire property developer is “totally unfit” to serve as President and argued he is “dangerous”.

Mr Yarmuth, who is serving his fifth term as a congressman, said the President did not look like someone who is in control of his "faculties". He said Mr Trump is not concerned with what happens after his round of applause stops and appears incapable of thinking through the consequences of his actions.

“He is demonstrating on a daily basis that he totally unfit for the office he serves in," Mr Yarmuth said in a speech to a local division of the NAACP.

"He is, in my opinion, a dangerous president. I'm not sure of his mental state, but I know that he doesn't portray someone who is in control of his faculties."

The Democrat expressed his concerns about the lack of political experience of those in the Trump cabinet, arguing the US is in “unchartered territory”. Mr Trump is the first person to be elected as US President with zero political or military experience.

“He seems unwilling and or incapable of thinking about or considering what happens after he acts or says something. He doesn’t consider the ramifications of what he does and in that realm, it’s always about what happens next. He doesn’t ever seem to think about the consequences”.

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"He doesn't seem to care about what happens once the applause stops. He seems to be in it solely for the applause, and that's what somebody with his ego and narcissism would be," he added. “That’s really bad for the country.”

Mr Yarmuth argued world leaders were “totally freaked out” by the US commander-in-chief because they did not know what to take seriously.

Earlier in February, 35 mental health professionals, including psychiatrists, psychologists and social workers, signed an open letter warning Mr Trump’s mental state “makes him incapable of serving safely as president”.