On Jan. 17, President Donald Trump tweeted: "No 'Cave' on the issue of Border and National Security." Eight days later, he caved, agreeing to reopen the government for three weeks without getting a penny for his border wall. His right-wing allies are spluttering in rage, but they shouldn't be surprised. This debacle confirms that Trump is not the "ultimate negotiator" he purports to be. He is, in fact, a lousy negotiator. Now he may be on the verge of concluding the worst deals of the century by pulling U.S. troops out of South Korea and Afghanistan in return for empty promises from Kim Jong Un and the Taliban.