President Trump last week revealed he would be “honoured” to meet Kim Jong-un if he was invited to visit North Korea.
The shock claim came just a day after the President had praised the North Korean dictator as a “pretty smart cookie”.
His comments have sparked concern among his fellow Republicans and Mrs Clinton, who also accused President Trump of having a “Twitter foreign policy”.
The former presidential hopeful said: “Negotiations are critical, but they have to be part of a broader strategy, not just thrown up on a tweet some morning that, ‘Hey let’s get together and, you know, see if we can get along and maybe we can come up with some sort of a deal.’ That doesn’t work.
Mrs Clinton also warned that former business tycoon had fallen into North Korea’s trap by offering to negotiate.
The former Secretary of State said: ”The North Koreans are always interested, not just Kim Jong-un but his father before him, were always interested in trying to get Americans to come to negotiate to elevate their status and their position.
“And we should be very careful about giving that away.”
Her sentiments have been echoed by several Republicans including Lindsey Graham, senator for South Carolina, who warned that meeting Kim Jong-un would only “empower” the dictator.
Mr Graham said: ”I’d find it very hard for me to sit down across the table from a guy who makes Bashar Assad look like a choir boy.